PC-SDD VSeries User’s Guide
PC-SDD V Series 4
Connector Pin Assignment
Pin Signal Function I/O Pin Signal Function I/O
1RESET- Bus Reset I2GND Ground
3DB7 Data Bus Bit7 I/O 4DB8 Data Bus Bit8 I/O
5DB6 Data Bus Bit6 I/O 6DB9 Data Bus Bit9 I/O
7DB5 Data Bus Bit 5 I/O 8DB10 Data Bus Bit 10 I/O
9DB4 Data Bus Bit4 I/O 10 DB11 Data Bus Bit11 I/O
11 DB3 Data Bus Bit3 I/O 12 DB12 Data Bus Bit12 I/O
13 DB2 Data Bus Bit2 I/O 14 DB13 Data Bus Bit13 I/O
15 DB1 Data Bus Bit1 I/O 16 DB14 Data Bus Bit14 I/O
17 DB0 Data Bus Bit0 I/O 18 DB15 Data Bus Bit15 I/O
19 GND Ground 20 KEY Key Pin
21 Reserved 22 GND Ground
23 IOW- Host I/O Write I24 GND Ground
25 IOR- Hose I/O Read I26 GND Ground
27 IORDY I/O ch Ready O28 CSEL Cable Select I
29 Reserved 30 GND Ground
31 INTRQ+ Interrupt Request O32 IOCS16- Drive 16bit I/O O
33 ADD1 Host Address 1 I34 PDIAG- Passed Diagnostics I/O
35 ADD0 Host Address 0 I36 ADD2 Host Address 2 I
37 CS0- Chip Select 0 I38 CS1- Chip Select 1 I
39 DASP- Active (LED) O40 GND Ground
Write Access Mean Time Before Failure
The PC-SDD V Series incorporates a feature called wear leveling that extends the
lifetime of its drive by averaging the number of write accesses to individual disk
sectors. If an error occurs in an attempt to write to a sector (even during wear
leveling), the PC-SDD V Series uses an internally reserved spare sector to substitute
for that sector. If an error occurs during a write to a sector with all the spare sectors
used up, the sector is marked as a bad sector. The time interval that will elapse before
the bad sector appears is referred to as "write access mean time before failure." It is
calculated differently between when part of the drive is rewritten and when its entire
capacity is rewritten.
*About wear leveling: When the drive attempts to write to the same sectors to update
a file over and over again, this feature substitutes less frequently accessed sectors for
more frequently accessed ones (alternating the sectors to write to) to average the
number of write accesses to individual sectors, thereby providing longer lifetime.
