IBM 4840-563, Справочное руководство системы

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DMA Assignments
DMA DATA WIDTH SYSTEM RESOURCE
0 8 bits only User Available for ISA bus
1 8 bits only User Available for ISA bus (normally used for LAN)
2 8 bits only RESERVED, Floppy
3 8 bits only Parallel Port if ECP, otherwise User Available for ISA bus
4 RESERVED - Cascade Channel
5 16 bits only User Available for ISA bus
6 16 bits only User Available for ISA bus
7 16 bits only User Available for ISA bus
Note: Channels 0-3 can transfer data in 64KB pages and channels 5-7 can transfer data in 128KB pages.
Special SurePOS 500-XX3 POS Devices Interfaces
ASIC PCI Function 0: POS Interface - special devices
Function 0 of the SurePOS 500-XX3 ASIC contains the interface for several special Point of Sale devices.
The Presence Sensor Interface is explained below. The EEPROM control, UART enable/disable control, and
the other functions are available by request for the ASIC specification from Partnerline. These items are
controllable through Setup and DOS tools, or intended for usage only by the BIOS, thus their interface details
are not included in this document. Below is the PCI Configuration space of function 0, with the Presence
Sensor device details in the next section.
31-24 23-16 15-8 7-0 Address
Device ID (02A2h) Vendor ID (1014h) 00h
Status Register Command Register 04h
Class Code (088000h) Revision
ID
(01h) 08h
Reserved (00h) Header Type (80h) Latency Timer
(00h)
Cache Line Size
(00h)
0Ch
RW Control Registers (16 Bytes of I/O Space)
10h
EEPROM (128 Bytes of Memory Space)
14h
Reserved (00000000h) 18h
Reserved (00000000h) 1Ch
Reserved (00000000h) 20h
Reserved (00000000h) 24h
Reserved (00000000h) 28h
PCI Subsystem Vendor/Subsystem ID (loaded from Config EEPROM)
2Ch
Reserved (00000000h) 30h
Reserved (00000000h) 34h
Reserved (00000000h) 38h
Reserved (00h) Reserved (00h)
Interrupt Pin Use
INTA# (01h)
Interrupt Line
3Ch
Reserved (00h) Reserved (00h)
Interrupt Status
Register A
Reserved (00h) 40h
Note: The interrupt in Function 0 is meant for Presence Sensor logic.
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