Pericom PI7C21P100 User manual

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User guide for PI7C21P100 Reference Board
By Robert Bautista
Introduction
The Pericom PI7C21P100 PCI-X bridge evaluation board demonstrates the bridge and allows testing of key features either
before or during design / layout stages. The PI7C21P100 PCI-X Bridge complies with PCI-X Addendum to the Local Bus
Specification Revision 1.0a, as well as PCI Local Bus Specification Revision 2.2, PCI-to PCI Bridge Architecture
Specification Revision 1.1 and PCI Power Management Interface Specification Revision 1.1.
Quick start (photo of PI7C21P100 reference board)
The numbers on the photo correspond to the text explanation on the right:
1) One standard and one straddle mount PCI-X connector.
2) Auxiliary power connector. (No need to connect external
p
ower in most applications). External power is required if
exceeds 25W.
3) Secondary VIO Voltage Select to the slot can be set to
either 3.3V or 5V.
(Secondary VIO Voltage Select to the slot is set to 3.3V
by default)
4) Switch to set bus speed and drive mode
5) Pin 1 on the golden PCI-X edge connector faces left when
looking down on the component (bridge IC).
6) Universal Edge Connector can be connected into a 3.3V
slot or a 5V slot
7) PCI-X Secondary bus is set to 133MHz by default.
(133MHz oscillator chip included)

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Components and Jumper Reference
U4 PI6C2510-133EL Clock Buffer
U17 Pericom 7C21P100 PCI-X Bridge
U31 Voltage Regulator
U32 Voltage Regulator
Y1 Oscillator Socket
SW1 Speed option and drive mode selection
J5 Auxiliary power connector
J23 P_PCIXCAP
J27 S_PCIXCAP
J28 JTAG
J29 Secondary VIO Voltage Select to the Slot
TABLES:
a) A table on the front shows the default
setting for SW1.
b) Table of tests points TP4, TP13, TP33,
TP34, TP69, TP70, TP71, TP85, TP91,
TP92 and TP86 …TP90.

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Switch Settings
SW1 Signal Default Full Description
1 S_SEL 100 Off “Off” = 133MHz, “On” = 100MHz (Secondary bus speed in PCI-X mode)
2 S_DRVR On “On” Use alternate output impedance, “Off” Use default impedance.
Note: See Driver Impedance Selection Table
3 P_DRVR On
“On” Use alternate output impedance, “Off” Use default impedance.
Note: See Driver Impedance Selection Table
4 NO CONNECT Off Not Used
Note: Off = Low On = High
Driver Impedance Selection Table
Primary
Bus Mode
Default Driver Mode
(P_DRVR is “OFF”)
Driver Mode if
(P_DRVR is ON”)
Secondary Bus
Mode
Default Driver Mode
(S_DRVR is “OFF”)
Driver Mode if
(S_DRVR is “ON”)
Conventional
PCI 20 ohm 40 ohm Conventional PCI 20 ohm 40 ohm
PCI-X 66 20 ohm 40 ohm PCI-X 66 20 ohm 40 ohm
PCI-X 100 20 ohm 40 ohm PCI-X 100 20 ohm 40 ohm
PCI-X 133 40 ohm 20 ohm PCI-X 133 40 ohm 20 ohm
Jumper Settings
Jumper Signal Default Full Description
J23 P_PCIXCAP NC “NC” Primary is PCI-X capable, “C” Primary is PCI mode.
J27 S_PCIXCAP NC “NC” Secondary is PCI-X capable, “C” Secondary is PCI mode.
J28 JTAG NC JTAG connector is not used
J29 Secondary VIO Voltage
Select to the Slot
Pin 1-2 “Pin 1-2” Secondary VIO voltage select to the slot is set to 3.3V, “Pin 2-3”
Secondary VIO voltage select to the slot is set to 5V.
Note: “NC” Not Connected “C” Connected
Before Powering the Board
a) Speed selection:
Using the oscillator socket (Y1), seat the oscillator chip into the socket for the speed setting of the secondary bus based upon
the input primary bus speed. The board will not function without the oscillator.
e.g. To operate the secondary bus at 100MHz, seat the 100MHz oscillator chip into the oscillator socket (Y1).
Seat the board into a PCI-X slot on the main system board.
Looking from the front of the motherboard, the small lip on our reference board points to the back of the motherboard, and
the component side with the PI7C21P100 bridge chip is on the left hand side. Normally you won’t need to connect power to
the reference board through header J5, unless you are cascading bridges. Otherwise the motherboard PCI-X connector is
adequate to powering the board with a few add-in cards.

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c) Connect any PCI/PCI-X cards desired on the secondary PCI-X bus. For all PCI-X connectors on our reference board,
when looking down onto the bridge IC, pin 1 is on the right side of the board. This also applies to the top mounted “straddle”
connector. Putting in any cards backwards will short 5V to ground through the PCI-X connector. Also each PCI-X
connector has “A1”, “B1”, “A94”, “B94” at the 4 corners of each slot, as a reminder where pin 1 is on each connector.
At this point, the Pericom PI7C21P100 reference board is ready for you to use.
Test Points Description
These allow convenient sampling of signals by logic analyzer or oscilloscope:
TP4 XCLK OUT TP86 GND
TP14 S_PCIXCAP_PU TP87 GND
TP33 S_FRAME_L TP88 GND
TP34 S_TRDY_L TP89 GND
TP69 S_GNT1 – GNT to 1st slot TP90 GND
TP70 S_GNT2 – GNT to 2nd slot
TP71 S_IRDY_L
TP85 +2.5V
TP91 S_REQ1
TP92 S_REQ2
Technical Support: http://www.pericom.com/support