AMMC004AWP データシートの表示（PDF） - Advanced Micro Devices

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AMMC004AWP

2, 4, or 8 Megabyte 5.0 Volt-only Flash Miniature Card

Advanced Micro Devices 

PRELIMINARY

MINIATURE CARD PAD ASSIGNMENTS

A0–A24

Address A0 to A24 are the address bus lines that can

address up to 32 Mwords (64 Mbytes). The address

lines are word addressed. The Miniature Card specifi-

cation does not require the Miniature Card to decode

the upper address lines. A 2 Mbyte Miniature Card that

does not decode the upper address lines would repeat

its address space every 2 Mbytes. Address 0h would

access the same physical location as 200000h,

400000h, 600000h, etc. On the 2 Mbyte cards, A20–

A24 are not connected. On the 4 Mbyte cards, A21–

A24 are not connected. On the 8 Mbyte cards, A22–

A24 are not connected.

D0–D15

Data lines D0 through D15 constitute the data bus. The

data bus is composed of two bytes; the low byte is D0–

D7 and the high byte is D8–D15. These lines are

tristated when OE# is high.

OE#

OE# indicates to the card that the current bus cycle is

a read cycle. The output enable access time (tOE) is the

delay from the falling edge of OE# to valid data at the

output pins (assuming the addresses have been stable

for at least tACC – tOE time).

WE#

WE# indicates to the card that the current bus cycle is a

write cycle. The falling edge of WE# latches address infor-

mation and the rising edge latches data/command informa-

tion.

VS1#

Voltage Sense 1 signal. This signal is left open or

not connected.

VS2#

Voltage Sense 2 signal. This signal is left open or

not connected.

CEL#

CEL# enables the low byte of the data bus (D0–D7) on

the card.

CEH#

CEH# enables the high byte of the data bus (D8–D15)

on the card.

RESET#

RESET# controls card initialization. When RESET#

transitions from a low state to a high state, the Minia-

ture Card resets to the Read state.

BUSY#

BUSY# is a signal generated by the card to indicate the

status of operations within the Miniature Card. When

BUSY# is high, the Miniature Card is ready to accept

the next command from the host. When BUSY# is low,

the Miniature Card is busy and unable to accept most

data operations from the host. In Flash Miniature Cards

the BUSY# signal is tied to the components’ RY/BY#

signal.

CD#

CD# is a grounded interface signal. After a Miniature

Card has been inserted, CD# will be forced low. The

card detect signal is located in the center of the second

row of interface signals, and should be one of the last

interface signals to connect to the host. Do not confuse

CD# with CINS#.

CINS#

CINS# is a grounded signal on the front of the Miniature

Card that is used for early detection of a card insertion.

CINS# makes contact on the host when the front of the

card is inserted into the socket, before the interface

signals connect.

BS8#

The BS8# (Bus size 8) signal indicates to the Miniature

Card that the host has an 8-bit bus. AMD Flash Minia-

ture Cards ignore this signal. An 8-bit host must

connect its D0–D7 data lines to D8–D15 on the Minia-

ture Card to retrieve the upper (odd) byte.

GND

Ground

VCC

Vcc is used to supply power to the card.

NC

No connect

RFU

Reserved for future use

6

AmMC0XXA

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