MCM72F6A

•MCM72F7A

5

MOTOROLA FAST SRAM

PIN DESCRIPTIONS

Pin Locations

Symbol

Type

Description

72, 155, 71, 154, 70, 152,

68, 151, 67, 149, 65, 148,

64, 146, 62, 145

A0 – A15

Input

Synchronous Address Inputs: These inputs are registered and must meet

setup and hold times.

156

ADSP

Input

Synchronous Addresss Status Controller: Initiates read, write, or chip

deselect cycle.

134, 44, 121, 31,

105, 15, 92, 86

DP0 – DP7

Synchronous Parity Data Inputs/Outputs.

140, 56, 139, 55, 137, 53,

136, 52, 50, 133, 49, 131,

47, 130, 46, 128, 127, 43,

125, 41, 124, 40, 122, 38,

37, 119, 35, 118, 34, 116,

32, 115, 111, 27, 110, 26,

108, 24, 107, 23, 21, 104,

20, 102, 18, 101, 17, 99,

98, 14, 96, 12, 95, 11, 93,

9, 8, 90, 6, 89, 5, 87, 3, 2

DQ0 – DQ63

I/O

Synchronous Data Inputs/Outputs.

167, 83

E0, E1

Input

Synchronous Chip Enable: Active low to enable chip. Negated high —

deselects chip when ADSP is asserted. E1 is only used on 1MB module.

166, 82

G0, G1

Input

Asynchronous Output Enable Input:

Low — enables output buffer.

High — DQx pins are high impedance.

G1 is only used on 1MB module.

158, 74, 113, 29

K0 – K3

Input

Clock: This signal registers the address, data in, and all control signals

except G0 and G1.

164, 80, 163, 79, 161,

77, 160, 76

W0 – W7

Input

Synchronous Byte Write Inputs.

4, 16, 33, 45, 57, 69, 94,

106, 123, 135, 147, 165

VDD

Supply

Power Supply: 3.3 V + 10%, – 5%. Must be connected on all modules.

1, 7, 10, 13, 19, 22, 25, 28,

30, 36, 39, 42, 48, 51, 54, 60,

63, 66, 73, 75, 78, 81, 84, 85,

88, 91, 97, 100, 103, 109,

112, 114, 117, 120, 126, 129,

132, 138, 141, 144, 150, 153,

157, 159, 162, 168

VSS

Supply

Ground.

58, 59, 61, 142, 143

NC

No Connection: There is no connection to the chip.

Next Cycle

Address Used

Ex

ADSP

Gx

DQx

WRITE

Deselect

None

1

0

X

High–Z

X

Begin Read

External Address

0

0

0

DQ

Read

Read

Current

X

1

1

High–Z

Read

Read

Current

X

1

0

DQ

Read

Begin Write

External

0

0

X

High–Z

Write

Write

Current

X

1

X

High–Z

Write

NOTES:

1. X = don’t care, 1 = logic high, 0 = logic low.

2. Write is defined as any Wx low.

3. G is an asynchronous signal and is not sampled by the clock K. G drives the bus immediately (tGLQX) following G going low.

4. On write cycles that follow read cycles, G must be negated prior to the start of the write cycle to ensure proper write data setup times. G must

also remain negated at the completion of the write cycle to ensure proper write data hold times.