USB97C102 datasheet(31/80 Pages) SMSC

31 / 80 page

SMSC DS – USB97C102

Page 31

Rev. 03/23/2000

Table 38 - ISA Bus Status Mask Register

BUS_MASK

(0x7F74 - RESET=0xFF)

ISA BUS STATUS MASK REGISTER

BIT

NAME

R/W

DESCRIPTION

CH3RQ_MASK

R/W

Channel 3 DMA Request ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH2RQ_MASK

R/W

Channel 2 DMA Request ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH1RQ_MASK

R/W

Channel 1 DMA Request ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH0RQ_MASK

R/W

Channel 0 DMA Request ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH3TC_MASK

R/W

Channel 3 Terminal Count ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH2TC_MASK

R/W

Channel 2 Terminal Count ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH1TC_MASK

R/W

Channel 1 Terminal Count ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

CH0TC_MASK

R/W

Channel 0 Terminal Count ISADMA Interrupt Mask

0 = Enable Interrupt

1 = Mask Interrupt

Table 39 - ISA I/O Window Base Register

IOBASE

(0x7F71 - RESET=0x00)

ISA I/O WINDOW BASE REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:0]

SA[15:8]

R/W

When the 8051 reads or writes to the ISA I/O Window,

this register is combined with the 8 bit offset in the 256

byte window and presented as the 64k I/O Space address

during an 8051-ISA IOR or IOW cycle

Table 40 - ISA Memory Window Base Register

MEMBASE

(0x7F72 - RESET=0x00)

ISA MEMORY WINDOW BASE REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:0]

SA[19:12]

R/W

When the 8051 reads or writes to the ISA Memory

Window, this register is combined with the 12 bit

offset in the 4k byte window and presented as the

1Mbyte Memory address during an 8051-ISA

MEMR or MEMW cycle.

8237 (ISADMA) REGISTER DESCRIPTION

Memory Map

Table 41 - ISADMA Memory Map

8237 MEMORY ADDRESS

DESCRIPTION

0xFC00-0xFFFF

1k Window to Packet with PNR=0x1F

0xF800-0xFBFF

1k Window to Packet with PNR=0x1E

0xF400-0xF7FF

1k Window to Packet with PNR=0x1D

0xF000-0xF3FF

1k Window to Packet with PNR=0x1C

0xEC00-0xEFFF

1k Window to Packet with PNR=0x1B

0xE800-0xEBFF

1k Window to Packet with PNR=0x1A

0xE400-0xE7FF

1k Window to Packet with PNR=0x19

0xE000-0xE3FF

1k Window to Packet with PNR=0x18

0xDC00-0xDFFF

1k Window to Packet with PNR=0x17

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