VT82C596 datasheet(17/96 Pages) ETC

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VT82C596B

Revision 0.3 June 17, 1999

-11-

Pinouts

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ISA Bus Interface

Signal Name

Pin #

I/O

Signal Description

SA[19:0]

V4, U4, W5,

T5, Y6, V6,

Y7, V7, U7,

W8, T8, Y9,

V9, U9, W10,

T10, Y11,

W11, T11, U11

ISA Address Bus

LA[23:17]

T12, Y13, V13,

U13, W14,

T14, Y15

ISA “Latched” Address Bus: The LA[23:17] address lines are bi-directional.

These address lines allow accesses to physical memory on the ISA bus up to

16Mbytes.

SD[15:0]

W19, Y19,

W18, Y18,

V17, Y17, T16,

W16, V1, T1,

Y2, W2, T2,

U2, W3, V3

ISA Bus Data. SD[15:0] provide the data path for devices residing on the ISA bus.

SD7:4 are strap options for keyboard inputs 6:3 (see Function 0 Rx5A)

SBHE#

W12

ISA Byte High Enable. SBHE# indicates, when asserted, that a byte is being

transferred on the upper byte (SD[15:8]) of the data bus. SBHE# is negated during

refresh cycles.

IOR#

ISA I/O Read. IOR# is the command to an ISA I/O slave device which indicates

that the slave may drive data on to the ISA data bus.

IOW#

ISA I/O Write. IOW# is the command to an ISA I/O slave device which indicates

that the slave may latch data from the ISA data bus.

MEMR#

V15

ISA Memory Read. MEMR# is the command to a memory slave which indicates

that it may drive data onto the ISA data bus.

MEMW#

U15

ISA Memory Write. MEMW# is the command to a memory slave which indicates

that it may latch data from the ISA data bus.

SMEMR#

ISA Standard Memory Read. SMEMR# is the command to a memory slave,

under 1MB, which indicates that it may drive data onto the ISA data bus

SMEMW#

ISA Standard Memory Write. SMEMW# is the command to a memory slave,

under 1MB, which indicates that it may latch data from the ISA data bus.

BALE

U10

ISA Bus Address Latch Enable. BALE is an active high signal asserted by the

VT82C596B to indicate that the address (SA[19:0], LA[23:17] and the SBHE#

signal) is valid

IOCS16#

V12

ISA 16-Bit I/O Chip Select. This signal is driven by I/O devices on the ISA Bus to

indicate that they support 16-bit I/O bus cycles.

MCS16#

Y12

ISA Memory Chip Select 16. ISA slaves that are 16-bit memory devices drive this

line low to indicate they support 16-bit memory bus cycles.

IOCHCK#

ISA I/O Channel Check. When this signal is asserted, it indicates that a parity or

an uncorrectable error has occurred for a device or memory on the ISA Bus.

IOCHRDY

IOD

ISA I/O Channel Ready. This signal is normally high. Devices on the ISA Bus

assert IOCHRDY low to indicate that additional time (wait states) is required to

complete the cycle.

ZWS#

ISA Zero Wait State. Devices on the ISA Bus assert ZWS# to indicate that no wait

states are required.

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