VI SDRAM CONTROLLER BLOCK: SDRAM INTERFACE

I/O Pins and Connection

I/O Pins

Table 2.1 lists the pins used for the SDRAM interface.

 

 

Table 2.1 I/O Pin List

Pin name

I/O

Function

A[13:12]/SDA[12:11],

O

Address bus

A[10:1]/SDA[9:0]

 

 

A[15:14]/SDBA[1:0]

O

SDRAM bank select signals

D[15:0]

I/O

Data bus (D0–D15)

#CE8/#RAS1/#CE14/#RAS3/#SDCE1

O

Area 8/14 chip enable / DRAM Row strobe / SDRAM chip enable 1

#CE7/#RAS0/#CE13/#RAS2/#SDCE0

O

Area 7/13 chip enable / DRAM Row strobe / SDRAM chip enable 0

#HCAS/#SDCAS

O

DRAM column address strobe (High-byte) / SDRAM column address

 

 

strobe

#LCAS/#SDRAS

O

DRAM column address strobe (Low-byte) / SDRAM row address strobe

BCLK/SDCLK

O

Bus clock output / SDRAM operating clock

P20/#DRD/SDCKE

I/O

I/O port / DRAM read / SDRAM clock enable

P21/#DWE/#GAAS/#SDWE

I/O

I/O port / DRAM write (Low-byte) / Area address strobe output for GA /

 

 

SDRAM write

P33/#DMAACK1/SIN3/SDA10

I/O

I/O port / HSDMA Ch. 1 acknowledge output / Serial I/F Ch. 3 data input /

 

 

SDRAM address bus 10

P32/#DMAACK0/#SRDY3/HDQM

I/O

I/O port / HSDMA Ch. 0 acknowledge output / Serial I/F Ch. 3 ready signal

 

 

output / SDRAM data (High-byte) input/output mask signal output

P15/EXCL4/#DMAEND0/#SCLK3/

I/O

I/O port / 16-bit timer 4 event counter input / HSDMA Ch. 0 end-of-transfer

LDQM

 

signal output / Serial I/F Ch. 3 clock input/output / SDRAM data (Low-byte)

 

 

input/output mask signal output

Connection Examples

Figures 2.2 and 2.3 show examples of how to connect 16-bit SDRAMs to the S1C33. Figure 2.4 shows an example of how to connect an 8-bit SDRAM to the S1C33.

S1C33

 

 

 

256M SDRAM

 

 

 

 

(4M x 16 bits x 4 banks)

SDA[12:11](A[13:12])

 

 

 

A[12:11]

 

 

 

 

 

 

 

 

 

SDA10(P33)

 

 

 

A10

 

 

 

SDA[9:0](A[10:1])

 

 

 

A[9:0]

 

 

 

 

 

 

 

 

 

SDBA[1:0](A[15:14])

 

 

 

BA[1:0]

 

 

 

 

 

 

 

 

 

D[15:0]

 

 

 

DQ[15:0]

 

 

 

 

 

 

 

 

 

BCLK

 

 

 

CLK

 

 

 

SDCKE(P20)

 

 

 

CKE

 

 

 

#SDCE0/1(#CE7/8)

 

 

 

#CS

 

 

 

#SDCAS(#HCAS)

 

 

 

#CAS

 

 

 

#SDRAS(#LCAS)

 

 

 

#RAS

 

 

 

#SDWE(P21)

 

 

 

#WE

 

 

 

HDQM(P32)

 

 

 

DQMU

 

 

 

LDQM(P15)

 

 

 

DQML

 

 

 

 

 

 

 

 

Figure 2.2 Connecting a 16-bit SDRAM (32MB)

B-VI-2-2

EPSON

S1C33L03 FUNCTION PART