JDS Uniphase SKB User manual

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This document facilitates operation of the SKB fiberoptic switch module. Note that the
only difference between the SKB variant described by this document and the standard
SKB is the type of connector. Information concerning pin assignment of the SKB should
be taken from this document only. Please disregard the information on this subject
contained in the SKB user's manual. Should you have any questions regarding the
following information, please contact JDS Uniphase directly at [phone], or by fax
at [phone], or via e-mail at [email protected], or visit our web site at
www.jdsuniphase.com.
Functional Notes
1. The SKB can be operated as an SK switch. Refer to notes in this document
describing SK emulation.
2. The pins allocated to SK emulation are located in the center portion of the 2x25
connector allowing direct ribbon cable drop-in to existing applications.
Pin Assignment
The SKB switch pin assignment has been updated from the existing SK switch pin
assignment, the primary differences are as follows:
1. D7 will be added to the interface.
2. /SOP and R/W will be added to the interface.
3. /RESET now called HOME.
4. /RESET added to provide a hardware reset.
Table 1: Phase II SKB Serial/Parallel Pin Assignment
PIN SIGNAL DESCRIPTION
1-8 NC No connect
9 /SOP Start of packet
10 R/W Read/write
11 /RESET This is a micro controller unit (MCU) reset
12 RESERVED For internal use only
13 GND* Shield
14 DGND** Digital ground, RESERVED FOR SK EMULATION
15 BUSY Busy output: low=idle, high= switching
16 D0 Data line 0
17 ERROR SK emulation: reset error output low = normal, high = switch mechanism position
check failed (channel position is verified when SK switch is reset)
SKB: ERROR asserted indicates an error code in the SKB error queue
18 D1 Data line 1
19 GND* Shield
20 D2 Data line 2
21 GND* Shield
22 D3 Data line 3

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PIN SIGNAL DESCRIPTION
23 GND* Shield
24 D4 Data line 4
25 /STROBE /STROBE input, active low: a high to low pulse = read data lines;
a high = ignore state of data lines. This line is internally pulled high via 10 K ohm
resistor to 5 VDC. For the SK emulation the home line is also read in via the
STROBE signal
26 D5 Data line 5
27 GND* Shield
28 D6 Data line 6
29 GND* Shield
30 /HOME Home input: low sends the switch to the home position in SK emulation mode
(Replaces RESET line in emulation mode)
31 GND* Shield
32 DGND** Digital ground, RESERVED FOR SK EMULATION
33 +5 VDC ** RESERVED FOR SK EMULATION
34 D7 Data line 7
35 +5 VDC ** RESERVED FOR SK EMULATION
36 +5 VDC ** RESERVED FOR SK EMULATION
37 NC No connect
38 NC No connect
39 RXTX- Transmit/receive data negative side (A)
40 RXTX+ Transmit/receive data positive side (B)
41 Bus Enable Active high parallel bus enabler
42 485 Shield RS485 signal shield
43 Trigger Active low trigger signal, TTL multi-dropped, pulled UP at slave with 100K
44 Attention Active low attention signal, open collector, pulled UP at master with 470 Ohms
45-50 NC No connect
*Note that GND (shield) signal lines should be connected to the common ground.
**Note that these pins are allocated to SK emulation. These pins should not be used
during SKB operation, unless the power pins (listed in table 3) are NOT connected.
Line Functionality
/SOP Input Line
The /SOP line provides a data packet start/stop mechanism for enhanced mode.
Transition of the /SOP line from a high-to-low state indicates the beginning of a data and
all subsequent bytes strobed are considered data packet bytes. Transition of the /SOP line
low-to-high indicates the end of a data packet. The master is responsible for controlling
the /SOP line.
This line is used as a means to distinguish between SKB enhanced operation and SK
emulation mode. The /SOP line is used when enhanced parallel mode operation is
desired. In SK emulation mode, this line should be pulled high, or not connected (this
line is pulled high by default on the SKB).

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D0 -- D7 Bi-directional Data Lines
SK emulation: valid channel numbers are strobed-in for the first motor are presented on
the data lines D0 to D6 in 7-bit binary format and parsed by the SKB on high-to-low
transitions of the STROBE line.
Enhanced mode: valid packet bytes presented on the data lines D0 – D7 in 8-bit binary
format and subsequently strobed-in to the SKB on high-to-low transitions of the
STROBE line, when the /SOP line is held low. Data direction is determined by the state
of the R/W line.
Table 2: Data Line Format
/SOP /HOME D7 D6 D5 D4 D3 D2 D1 D0 channel #
SK Emulation
1 0 x x x x x x x x 0 (home)
1 1 x 0 0 0 0 0 0 0 1
1 1 x 0 0 0 0 0 0 1 2
1 etc x 0 0 0 0 0 1 0 3
1 etc x etc etc etc etc etc etc etc etc
1 1 x 1 1 1 1 1 1 1 128
Enhanced Mode
0 X0 0 0 0 0 0 0 0 0
0 X0 0 0 0 0 0 0 1 1
0 X0 0 0 0 0 0 1 0 2
0 Xetc etc etc etc etc etc etc etc etc
0 X1 1 1 1 1 1 1 1 255
Notes:
1. The value 0 indicates that the input should be set low (i.e., < 0.8 VDC).
2. The value 1 indicates that the input should be set high (i.e., ≥2 VDC).
3. The ‘x’ symbol indicates a ''irrelevant" condition.
4. Home is represented by RESET.
/STROBE Input Line
In SK emulation mode the /STROBE line is used to select new channel positions. A high-
low transition of the /STROBE line initiates a read of the data lines D0-D6, which is used
to build a 7-bit data byte, which is subsequently interpreted as a channel number of on the
first motor.
A change on the data lines has no effect until there is a high-to-low transition on the
/STROBE line. In emulation mode, a change on the /HOME line also has no effect unless
it is held low while the /STROBE line has a high-to-low transition.

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In enhanced mode, the /STROBE line is used to signal the SKB to read data from or write
data to the data lines. A change on the data lines has no effect until there is a high-to-low
transition on the /STROBE line. The /STROBE line is driven by the master for both
transmit and receive operations.
R/W Input Line
The R/W line is only used in enhanced mode. The R/W line is driven by the master as a
bus direction control. If the R/W line is driven LOW, /D0-/D7, /SOP and /STROBE line
transitions are interpreted as output operations from the master to the slave. If R/W is
driven high, operations are interpreted as output from the slave to the master.
In SK emulation mode the R/W line must be low to write data to the SKB. Note that this
line is pulled low by default within the SKB.
/HOME Input Line
This line is used in emulation mode. The /HOME line overrides the data lines. A low on
this line forces the SK switch to go to the HOME position and verify the previous
channel position. After this has occurred the SK common stays in the home position.
Note the /HOME must be strobed-in using the /STROBE line. Changes on the /HOME
line have no effect until a high-to-low transition occurs on the /STROBE line.
This line is called RESET on the SK product.
/RESET Input Line
Reset resets the MCU. This is a “hard” reset of the SKB module. All communication
interfaces will be reset.
BUSY Output Line
In SK emulation mode, the BUSY line provides an indication of the switching
mechanism state. The line is LOW when the switch is idle and HIGH while the switching
mechanism is moving to an output channel.
In enhanced mode, the BUSY line provides a flow control mechanism. The slave drives
the BUSY line high after each byte is strobed in. The master will not toggle any lines
until a high-to-low transition of the BUSY line is detected.
ERROR Output Line
In SK emulation mode the ERROR line reports the result of the self-test operation that
occurs whenever the SK switch is reset. If the test fails, the ERROR line goes high and
stays high until a self-test operation is invoked again (assuming the self-test passes on the
next attempt). The error most often indicates a mechanical fault. If an invalid channel
(out of range channel) is strobed in the error line will go high and stay high until a valid
channel is strobed-in.
In the SKB enhanced mode the ERROR line is used to flag the master if the slave detects
an error. When the error line is high this indicates that there is an error in the error

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queue. The ERROR line is driven low when the errors are read out of the error queue or
the error queue is cleared.
Power Interface
The SKB switch is powered through a single 4 pin connector. The pin assignment is
shown in Table 3. In the case of SK emulation, the power connector is not necessary
when there is less than 8 inches of cable.
Table 3: Phase II Power Pin
PIN SIGNAL DESCRIPTION
1 - Reserved
2 GND Ground
3 NC No connect
4 +5V 5 volts supply in
Connector Information
The connector on the SKB switch is an IDE, 50(2x25) male + 4 male power, PCB, edge-
mount connector, (Comm Con P/N 7514).
The recommended mate for SKB operation is an IDE, 50(2x25) female + 4 female power,
right angle connector (Comm Con P/N 7510).
The recommended mate for SK emulation is a 2x13 female ribbon connector.
For details on pin numbering and connector dimensions, please refer to Figures 1 and 2
respectively. For further information about connector specifications, please contact:
Comm Con Connectors, Inc.
1848 Evergreen Street, Duarte, CA 91010
Phone: [phone] Fax: [phone]
Email: [email protected]
Home Page: http://www.commcon.com

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Figure 1: The IDE 2x25 Connector on an SKB Switch

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Ground connection
Pins used for SK emulation
Figure 2: Connector Dimensions