Preliminary - Information Subject to Change - 9/24/98
EZ-USB Development Board
5 - 13
PLD Signals
U5 is a 3.3 volt 22V10 PLD that develops the RAM chip enable and
read signals. It also has spare inputs and outputs, as shown in the
following table. Signals shown as “Not used” can be used for any
purpose by re-programming the 22V10 based on the ABEL file
shown in “PLD Source File” on page 5-15.
Table 5-11: 22V10 Signals
U5 Pin
Signal
Function
1
NC
---
2
PA2/OE#
Not used
3
PA3/CS#
Not used
4
BKPT
Not used
5
PSEN
AN2131 PSEN# pin
6
PC7/RD#
AN2131 RD# pin
7
MM0
Memory Mode Switch Select 0
8
NC
---
9
MM1
Memory Mode Switch Select 1
10
SPARE
Not Used
11
A12
AN2131 A12
12
A13
AN2131 A13
13
A14
AN2131 A14
14
GND
---
15
NC
---
16
A15
AN2131 A15
17
PF0
Not Used (expansion P2-11)
18
PF1
Not used (expansion P2-9)
19
PF2
Not used (expansion P2-7)
20
PF3
Not used (expansion P2-5)
21
EA
AN2131Q EA pin
