MPC2004

•MPC2005

6–5

MOTOROLA FAST SRAM

PIN DESCRIPTIONS

Pin Locations

Symbol

Type

Description

68, 69, 70, 71, 73, 74, 75,

76, 78, 79, 80, 82, 83, 84,

85, 159, 160, 161, 162,

164, 165, 166, 167, 169,

170, 171, 173, 174, 175

A0 – A28

Input

Address Inputs – (MSB:0, LSB:28)

62, 63

ADDR0A,

ADDR0B

Input

Least significant address bit when asynchronous SRAMs are used.

153, 154

ADDR1A,

ADDR1B

Input

Next to least significant address bit when asynchronous SRAMs are used.

30, 56, 117, 146, 148

CLK0 – CLK4

Input

Clock Inputs – CLK2 is for Tag RAM, CLK0, 1, 3, and 4 are for SRAMs.

For 1MB use all the clocks. For 512KB or less us CLK0–CLK2 only.

4, 5, 6, 7, 10, 11, 12, 14,

16, 17, 19, 20, 22, 24, 25,

26, 27, 95, 96, 97, 98, 101,

102, 103, 105, 107, 108,

110, 111, 113, 115, 119

DH0 – DH31

I/O

High Data Bus – (MSB:0, LSB:31)

32, 33, 34, 37, 38, 39, 40,

43, 44, 45, 47, 49, 50, 52,

53, 54, 121, 122, 124, 125,

126, 129, 130, 131, 133,

135, 136, 138, 139, 141,

143, 144

DL0 – DL31

I/O

Low Data Bus – (MSB:0, LSB:31)

9, 15, 21, 28, 35, 42, 48, 58

DP0 – DP7

I/O

Data Parity Bus – (MSB:0, LSB:7)

3, 94

PD2, PD3

Output

Presence detect bits 2 and 3.

2

PD0/IDSCLK

Input

Presence detect bit 0/EEPROM serial clock.

93

PD1/IDSDATA

I/O

Presence detect bit 1/EEPROM serial data.

64, 65

SRAMADS0,

SRAMADS1

Input

SRAM Address Strobe – For 512KB or less us SRAM ADS0 only.

151

SRAM ALE

Input

SRAM Address Latch Enable – Use for asynchronous SRAM only.

155, 156

SRAMCNTEN0,

SRAMCNTEN1

Input

SRAM Count Enables – For 512KB or less use SRAM CNT EN0 only.

59, 60

SRAMOE0,

SRAMOE1

Input

SRAM Output Enables – For 512KB or less use SRAM OE0 only.

100, 106, 112, 120, 128,

134, 140, 150

SRAMWE0 –

SRAMWE7

Input

SRAM Write Enables – (MSB:0, LSB:7)

87

TAGCLR

Input

Tag RAM clear.

88

TAG MATCH

Output

Tag RAM match indication.

178

TAG VALID

Input

Tag RAM valid bit.

179

TAGWE

Input

Tag RAM write enable.

89

TAGOE

Input

Tag RAM output enable.

90

DIRTYIN

Input

Dirty input bit.

181

DIRTYOUT

Output

Dirty output bit.

180

STANDBY

Input

Standby pin. Reduces standby power consumption.

176

RESERVED

Reserved pin.

8, 23, 51, 61, 77, 99, 114,

142, 152, 168

VCC3

Input

+ 3.3 V power supply.