GX1 datasheet(36/247 Pages) NSC

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Signal Definitions (Continued)

GNT[2:0]#

E1,

F2,

H2,

K4,

Grant Lines

GNT# indicates to the requesting master that it has been granted

access to the bus. Each master has its own GNT# line. GNT# can

be pulled away at any time a higher REQ# is received or if the

master does not begin a cycle within a minimum period of time (16

SYSCLKs).

2.2.2

PCI Interface Signals (Continued)

Signal Name

BGA

Pin No.

SPGA

Pin No

Type

Description

2.2.3

Memory Controller Interface Signals

Signal Name

BGA

Pin No.

SPGA

Pin No.

Type

Description

MD[63:0]

Refer

Table 2-3

Refer

Table 2-5

I/O

Memory Data Bus

The data bus lines driven to/from system memory.

MA[12:0]

Refer

Table 2-3

Refer

Table 2-5

Memory Address Bus

The multiplexed row/column address lines driven to the system

memory.

Supports 256 MB SDRAM.

BA[1:0]

AD26,

AD25

AJ33,

AK36

Bank Address Bits

These bits are used to select the component bank within the

SDRAM.

CS[3:0]#

AE23,

V25,

AD23,

V26

AK32,

Z34,

AN33,

AA35

Chip Selects

The chip selects are used to select the module bank within the

system memory. Each chip select corresponds to a specific mod-

ule bank.

If CS# is high, the bank(s) do not respond to RAS#, CAS#, WE#

until the bank is selected again.

RASA#,

RASB#

W24,

W25

AB36,

AB34

Row Address Strobe

RAS#, CAS#, WE# and CKE are encoded to support the different

SDRAM commands. RASA# is used with CS[1:0]#. RASB# is

used with CS[3:2]#.

CASA#,

CASB#

P25,

R26

W37,

X36

Column Address Strobe

RAS#, CAS#, WE# and CKE are encoded to support the different

SDRAM commands. CASA# is used with CS[1:0]#. CASB# is

used with CS[3:2]#.

WEA#,

WEB#

R25,

R24

W33,

W35

Write Enable

RAS#, CAS#, WE# and CKE are encoded to support the different

SDRAM commands. WEA# is used with CS[1:0]#. WEB# is used

with CS[3:2]#.

CKEA,

CKEB

AF24,

AD16

AL33,

AN23

Clock Enable

For normal operation, CKE is held high. CKE goes low during

SUSPEND. CKEA is used with CS[1:0]#. CKEB is used with

CS[3:2]#.

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