Data Sheet E0094N20 (Ver. 2.0)

5

MC-4R256FKE6D

Module Connector Pad Description

(1/2)

Signal

I/O

Type

Description

GND

–

–

Ground reference for RDRAM core and interface. 72 PCB connector pads.

LCFM

I

RSL

Clock from master. Interface clock used for receiving RSL signals from the

Channel. Positive polarity.

LCFMN

I

RSL

Clock from master. Interface clock used for receiving RSL signals from the

Channel. Negative polarity.

LCMD

I

Serial Command used to read from and write to the control registers. Also used

for power management.

LCOL4..LCOL0

I

RSL

Column bus. 5-bit bus containing control and address information for column

accesses.

LCTM

I

RSL

Clock to master. Interface clock used for transmitting RSL signals to the

Channel. Positive polarity.

LCTMN

I

RSL

Clock to master. Interface clock used for transmitting RSL signals to the

Channel. Negative polarity.

LDQA8..LDQA0

I/O

RSL

Data bus A. A 9-bit bus carrying a byte of read or write data between the Channel

and the RDRAM. LDQA8 is non-functional on modules with x16 RDRAM devices.

LDQB8..LDQB0

I/O

RSL

Data bus B. A 9-bit bus carrying a byte of read or write data between the Channel

and the RDRAM. LDQB8 is non-functional on modules with x16 RDRAM devices.

LROW2..LROW0

I

RSL

Row bus. 3-bit bus containing control and address information for row accesses.

LSCK

I

Serial clock input. Clock source used to read from and write to the RDRAM

control registers.

NC

–

–

These pads are not connected. These 24 connector pads are reserved for future

use.

RCFM

I

RSL

Clock from master. Interface clock used for receiving RSL signals from the

Channel. Positive polarity.

RCFMN

I

RSL

Clock from master. Interface clock used for receiving RSL signals from the

Channel. Negative polarity.

RCMD

I

Serial Command Input used to read from and write to the control registers. Also

used for power management.

RCOL4..RCOL0

I

RSL

Column bus. 5-bit bus containing control and address information for column

accesses.

RCTM

I

RSL

Clock to master. Interface clock used for transmitting RSL signals to the

Channel. Positive polarity.

RCTMN

I

RSL

Clock to master. Interface clock used for transmitting RSL signals to the

Channel. Negative polarity.

RDQA8..RDQA0

I/O

RSL

Data bus A. A 9-bit bus carrying a byte of read or write data between the Channel

and the RDRAM. RDQA8 is non-functional on modules with x16 RDRAM devices.

RDQB8..RDQB0

I/O

RSL

Data bus B. A 9-bit bus carrying a byte of read or write data between the Channel

and the RDRAM. RDQB8 is non-functional on modules with x16 RDRAM devices.

RROW2..RROW0

I

RSL

Row bus. 3-bit bus containing control and address information for row accesses.