Data Sheet fido5100/fido5200
Rev. 0 | Page 9 of 19
Table 5. Pin Function Descriptions
Pin No. Mnemonic Direction
1
Description
A1 D02/AD02 I/O
Data Bus Bit 02 Nonmultiplexed/Data Bus Bit 02 Multiplexed. This is a
multifunction pin.
When MBS = 0, Pin A1 (D02) is Data Bus Bit 02 to and from the REM switch for
the nonmultiplexed address data bus.
When MBS = 1, Pin A1 (AD02) is for the multiplexed address data bus, Bit 02 of
the address (LSB), and Bit 02 of the data.
A2 D04/AD04 I/O
Data Bus Bit 04 Nonmultiplexed/Data Bus Bit 04 Multiplexed. This is a
multifunction pin.
When MBS = 0, Pin A2 (D04) is Data Bus Bit 04 to and from the REM switch for
the nonmultiplexed address data bus.
When MBS = 1, Pin A2 (AD04) is for the multiplexed address data bus, Bit 04 of
the address, Bit 04 of the data.
A3 D07 I/O Data Bus Bit 07. Pin A3 is Data Bus Bit 07 to and from the REM switch.
A4 D11 I/O Data Bus Bit 11. Pin A4 is Data Bus Bit 11 to and from the REM switch.
A5 D15 I/O Data Bus Bit 15. Pin A5 is Data Bus Bit 15 to and from the REM switch.
Data Bus Bit 18. Pin A6 is Data Bus Bit 18 to and from the REM switch.
A7 D19 I/O Data Bus Bit 19. Pin A7 is Data Bus Bit 19 to and from the REM switch.
A8 D22 I/O Data Bus Bit 22. Pin A8 is Data Bus Bit 22 to and from the REM switch.
A9 D25 I/O Data Bus Bit 25. Pin A9 is Data Bus Bit 25 to and from the REM switch.
A10 D27 I/O Data Bus Bit 27. Pin A10 is Data Bus Bit 27 to and from the REM switch.
A11 D30 I/O Data Bus Bit 30. Pin A11 is Data Bus Bit 30 to and from the REM switch.
A12 D31 I/O Data Bus Bit 31. Pin A12 is Data Bus Bit 31 to and from the REM switch.
B1 D01 I/O Data Bus Bit 01. Pin B1 is Data Bus Bit 01 to and from the REM switch.
B2 D03/AD03 I/O
Data Bus Bit 03 Nonmultiplexed/Data Bus Bit 03 Multiplexed. This is a
multifunction pin.
When MBS = 0, Pin B2 (D03) is Data Bus Bit 03 to and from the REM switch for
the nonmultiplexed address data bus.
When MBS = 1, Pin B2 (AD03) is for the multiplexed address data bus, Bit 03 of
the address, Bit 03 of the data.
B3 D06 I/O Data Bus Bit 06. Pin B3 is Data Bus Bit 06 to and from the REM switch.
B4 D10 I/O Data Bus Bit 10. Pin B4 is Data Bus Bit 10 to and from the REM switch.
B5 D14 I/O Data Bus Bit 14. Pin B5 is Data Bus Bit 14 to and from the REM switch.
Data Bus Bit 17. Pin B6 is Data Bus Bit 17 to and from the REM switch.
B7 D20 I/O Data Bus Bit 20. Pin B7 is Data Bus Bit 20 to and from the REM switch.
B8 D23 I/O Data Bus Bit 23. Pin B8 is Data Bus Bit 23 to and from the REM switch.
B9 D26 I/O Data Bus Bit 26. Pin B9 is Data Bus Bit 26 to and from the REM switch.
B10 D29 I/O Data Bus Bit 29. Pin B10 is Data Bus Bit 29 to and from the REM switch.
Output Enable. Setting Pin B11 low allows the REM switch to drive data lines.
B12
WE
I
Write Enable. Setting Pin B12 low enables a write; setting Pin B12 high enables
a read.
C1 A04/UNUSED I Address Line 04/Multiplexed Address Bus (UNUSED). This is a multifunction pin.
Pin C1 is Address Line 04 when MBS = 0 for the nonmultiplexed address data
bus. When MBS = 1, Pin C1 is Bit 04 of the address bus. Line A04 is sampled on
the falling edge of
CS (Pin D12).
Pin C1 is unused when MBS = 1 for the multiplexed address data bus.
C2 D00 I/O Data Bus Bit 00. C2 is Data Bus Bit 00 to and from the REM switch.
C3 D05/A05 I/O
Data Bus Bit 05 Nonmultiplexed/Data Bus Bit 05 Multiplexed. This is a
multifunction pin.
When MBS = 0, Pin C3 (D05) is Data Bus Bit 05 to and from the REM switch for
the nonmultiplexed address data bus.
When MBS = 1, Pin C3 (A05) is for the multiplexed address data bus, Bit 05 of
the address, Bit 05 of the data.
C4 D09 I/O Data Bus Bit 09. Pin C4 is Data Bus Bit 09 to and from the REM switch.
C5 D13 I/O Data Bus Bit 13. Pin C5 is Data Bus Bit 13 to and from the REM switch.
Data Bus Bit 16. Pin C6 is Data Bus Bit 16 to and from the REM switch.
