STI5500 datasheet(4/11 Pages) STMICROELECTRONICS

4 / 11 page

NFI

NTI

II - PIN DESCRIPTION (continued)

II.2 - Pin List (continued)

Name

Type

Function

SDRAM INTERFACE

78-81, 69, 70, 71, 72, 73,

74, 82, 83

AD[0:11]

SDRAM Address Bus

92, 93, 94, 97, 98, 99, 100,

101, 106, 107, 108, 109,

112-115

DQ[0:15]

I/O

SDRAM Data (Lower Byte)

84, 85

NOT_SDCS0-1

SDRAM Chip Selects

NOT_SDCAS

SDRAM CAS

NOT_SDRAS

SDRAM RAS

NOT_SDWE

SDRAM Write Enable

104

MEMCLKIN

SDRAM Memory Clock Input

MEMCLKOUT

SDRAM Memory Clock Output

DQML

DQ Mask Enable (Lower)

105

DQMU

DQ Mask Enable (Upper)

ROM AND EXTERNAL MICROPROCESSOR

161-170, 173-183

ADR[1:21]

I/O

External Memory Address Bus

141-148, 151-158

DATA[0:15]

I/O

External Memory Data Bus

128

NOT_RAS1_OR_HOLDREQ

DRAM RAS or Bus Request to External Micro

136

READY

Hold off External Micro

133

READNOTWRITE_OR_DMAACK

I/O

DRAM R/W Strobe or DMA Acknowledge from

External Micro

121, 122

NOT_WE[0:1]

I/O

Write Enable of SRAM

129

NOT_CAS0_OR_HOLDACK

O/I

DRAM CAS or Bus Grant from External Micro

132

NOT_CAS1_OR_NOT_DMAREQ

DRAM CAS or DMA Request (Ready) to

External Micro

124-126

NOT_CE[1:3]

Chip Select for Banks 1 - 3

135

NOT_CS

Chip Select to Access SDRAM

137

PPC_CLK

Power PC System Clock

127

NOT_RAS0_OR_NOT_CE4

DRAM RAS or Chip Select for Bank 0

134

DMAXFER

DMA Transfer Control from External Micro

138

NOT_PPC_MODE

Presence of Power PC

123

NOT_OE

I/O

Output Enable of RAM / ROM

SDAV INERFACE

SDAV_CLK

I/O

Data Strobe / CLK

SDAV_DATA

I/O

Data Line

SDAV_DIR

Direction for Transmit Truefer Transmit, Pulse

for Receive

OSC_IN

I/O

49.152MHz Crystal Input

NRSS INTERFACE

NRSS_CLK

NRSS Serial Clock

NRSS_IN

NRSS Serial Data Input

NRSS_OUT

NRSS Serial Data Output

P1394 INTERFACE

P1394_CLK

I/O

Data Strobe / CLK

P1394_DATA

I/O

Data Line

P1394_P_CLK

I/O

Packet Clock

STi5500

4/11

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