Table 6-43. Dma Channel Control Registers - AMD Geode SC3200 Data Book

Core Logic Module - ISA Legacy Register Space
6.4.7 ISA Legacy Register Space
The ISA Legacy registers reside in the ISA I/O address
space in the address range from 000h to FFFh and are
accessed through typical input/output instructions (i.e.,
CPU direct R/W) with the designated I/O port address and
8-bit data.
The bit formats for the ISA Legacy I/O Registers plus two
chipset-specific configuration registers used for interrupt
mapping in the Core Logic module are given in this section.
The ISA Legacy registers are separated into the following
DMA Channel Control Registers, see Table 6-43
Bit Description
I/O Port 000h
Written as two successive bytes, byte 0, 1.
I/O Port 001h
Written as two successive bytes, byte 0, 1.
I/O Port 002h
Written as two successive bytes, byte 0, 1.
I/O Port 003h
Written as two successive bytes, byte 0, 1.
I/O Port 004h
Written as two successive bytes, byte 0, 1.
I/O Port 005h
Written as two successive bytes, byte 0, 1.
I/O Port 006h
Written as two successive bytes, byte 0, 1.
I/O Port 007h
Written as two successive bytes, byte 0, 1.
I/O Port 008h (R/W)
Read
7 Channel 3 Request. Indicates if a request is pending.
0: No.
1: Yes.
6 Channel 2 Request. Indicates if a request is pending.
0: No.
1: Yes.
5 Channel 1 Request. Indicates if a request is pending.
0: No.
1: Yes.
4 Channel 0 Request. Indicates if a request is pending.
0: No.
1: Yes.
3 Channel 3 Terminal Count. Indicates if TC was reached.
0: No.
1: Yes.
AMD Geode™ SC3200 Processor Data Book

Table 6-43. DMA Channel Control Registers

DMA Channel 0 Address Register (R/W)
DMA Channel 0 Transfer Count Register (R/W)
DMA Channel 1 Address Register (R/W)
DMA Channel 1 Transfer Count Register (R/W)
DMA Channel 2 Address Register (R/W)
DMA Channel 2 Transfer Count Register (R/W)
DMA Channel 3 Address Register (R/W)
DMA Channel 3 Transfer Count Register (R/W)
DMA Status Register, Channels 3:0
• DMA Page Registers, see Table 6-44
• Programmable Interval Timer Registers, see Table 6-45
• Programmable Interrupt Controller Registers, see Table
6-46
• Keyboard Controller Registers, see Table 6-47
• Real-Time Clock Registers, see Table 6-48
• Miscellaneous Registers, see Table 6-49 (includes 4D0h
and 4D1h Interrupt Edge/Level Select Registers)
32581C
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