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參數(shù)資料
| 型號： | MC68SC302 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 32-Bit Microprocessor(32位微處理器) |
| 中文描述： | 32位微處理器（32位微處理器） |
| 文件頁數(shù)： | 113/218頁 |
| 文件大小： | 521K |
| 代理商： | MC68SC302 |
ISA Plug and Play Interface
MOTOROLA
MC68SC302 USER’S MANUAL
5-7
5.4 ISA-PNP CONFIGURATION PROGRAMMING
If the ISA-PNP configuration process is managed by the MC68SC302, the resource data
is
stored in a byte serial device (serial EPROM). Figure 5-5 describes the resource data layout.
The exact format of resource data is described in the Plug and Play ISA Specification.
The resource data describes how many logical devices are on the card and the resource
requirements of the logical devices. The chip is intended to support one logical device,
therefore one set of logical device configuration registers is defined. During system
configuration, the software reads resource data of each card, performs arbitration and
assigns resources to cards writing configuration registers for IRQ, I/O, memory and DMA
resources. It is the responsibility of software to ensure that every resource requested by
hardware is programmed, even if the resource is not assigned.
The following types of resources must be requested and programmed for the SC302 chip:
1 IRQ descriptor
1 I/O or memory descriptor for the internal space
1 I/O or memory descriptor for CS0
Because of register sharing (I/O and memory configuration registers are shared) I/O and
memory modes for a particular descriptor cannot be enabled simultaneously. However one
descriptor can be set-up for I/O mode while the other descriptor can be set up for memory
mode. This allows the internal MC68SC302 space to be, say, I/O mode while the external
chip select space can be mapped as a memory space. If a mode is disabled, the reads from
the related configuration registers will return 0. The mode programming is performed
through the byte serial device’s byte 0x07. See 5.4.1Resource Data Layout in a Byte Serial
Device for more information.
5.4.1 Resource Data Layout in a Byte Serial Device
There is a predefined layout for the ISA-PNP resource data, illustrated in Figure 5-5.
In the EEPROM, resource data starts from 0x00 with the first byte of Vendor ID. To the host
PC, however, the first byte of Vendor ID is located at 0x08. ISA-PNP hardware performs
address translation on every access to the resource data.
The range of EEPROM addresses from 0x00 to 0x07 is allocated to vendor defined
configuration information (Table 5-3).
The first two bytes are used to define EEPROM type and enforce debug mode.
Table 5-3. Resource Data Layout
ADDRESS
NAME
REGISTER-DESTINATION
0x00-01
0x02-06
0x07
0x08
Serial EEPROM Type/Mode
Reserved for future use. Must be programmed to 0
Implementation Specific Information
First byte of Standard Resource Data
-
-
0x22
-
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