Signal Definitions

32581C

 

 

3.4.7Sub-ISA Interface Signals

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

A[23:0]

See Table

O

Address Lines

AD[23:0]

 

3-3 on

 

 

 

 

page 40.

 

 

 

 

 

 

 

 

D15

See Table

I/O

Data Bus

STOP#

 

3-3 on

 

 

 

D14

 

 

IRDY#

page 40.

 

 

 

 

 

 

D13

 

 

TRDY#

 

 

 

 

 

 

 

 

D12

 

 

 

PAR

 

 

 

 

 

D11

 

 

 

C/BE3#

 

 

 

 

 

D10

 

 

 

C/BE2#

 

 

 

 

 

D9

 

 

 

C/BE1#

 

 

 

 

 

D8

 

 

 

C/BE0#

 

 

 

 

 

D[7:0]

 

 

 

AD[31:24]

 

 

 

 

 

BHE#

E4

O

Byte High Enable. With A0, defines byte

DEVSEL#

 

 

 

accessed for 16 bit wide bus cycles.

 

 

 

 

 

 

IOCS1#

D10

O

I/O Chip Selects

GPIO1+TFTD12

 

 

 

 

 

 

N30

 

 

AB1D+GPIO1

 

 

 

 

 

IOCS0#

A10

 

 

GPIO17+TFTDCK

 

 

 

 

 

ROMCS#

C30

O

ROM or Flash ROM Chip Select

BOOT16 (Strap)

 

 

 

 

 

DOCCS#

A9

O

DiskOnChip or NAND Flash Chip Select

GPIO20+TFTD0

 

 

 

 

 

 

N31

 

 

AB1C+GPIO20

 

 

 

 

 

TRDE#

D11

O

Transceiver Data Enable Control. Active low for

GPIO0

 

 

 

Sub-ISA data transfers. The signal timing is as fol-

 

 

 

 

lows:

 

 

 

 

In a read cycle, TRDE# has the same timing as

 

 

 

 

RD#.

 

 

 

 

In a write cycle, TRDE# is asserted (to active

 

 

 

 

low) at the time WR# is asserted. It continues

 

 

 

 

being asserted for one PCI clock cycle after

 

 

 

 

WR# has been negated, then it is negated.

 

 

 

 

 

 

RD#

B8

O

Memory or I/O Read. Active on any read cycle.

CLKSEL0 (Strap)

 

 

 

 

 

WR#

B9

O

Memory or I/O Write. Active on any write cycle.

---

 

 

 

 

 

IOR#

D9

O

I/O Read. Active on any I/O read cycle.

DOCR#+GPIO14

 

 

 

 

 

IOW#

A8

O

I/O Write. Active on any I/O write cycle.

DOCW#+GPIO15

 

 

 

 

 

DOCR#

D9

O

DiskOnChip or NAND Flash Read. Active on any

IOR#+GPIO14

 

 

 

memory read cycle to DiskOnChip.

 

 

 

 

 

 

DOCW#

A8

O

DiskOnChip or NAND Flash Write. Active on

IOW#+GPIO15

 

 

 

any memory write cycle to DiskOnChip.

 

 

 

 

 

 

IRQ9

AA3

I

Interrupt 9 Request Input. Active high.

IDE_DATA6

 

 

 

Note: If IRQ9 function is selected but not used,

 

 

 

 

tie IRQ9 low.

 

 

 

 

 

 

IOCHRDY

C9

I

I/O Channel Ready

GPIO19+INTC#

 

 

 

Note: If IOCHRDY function is selected but not

 

 

 

 

used, tie IOCHRDY high.

 

 

 

 

 

 

 

 

 

 

 

AMD Geode™ SC3200 Processor Data Book

 

57

Page 57
Image 57
AMD SC3200 manual Sub-ISA Interface Signals