參數(shù)資料
型號(hào): MC68QH302
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): 12/50頁
文件大?。?/td> 6613K
代理商: MC68QH302
MOTOROLA
MC68QH302 Supplement to the MC68302 Users Manual
3
In non-QH mode, all three SCCs can be used in standard 302 conTgurations.
Pin-compatible with the existing TQFP 302 package
General QH302 changes relative to 302 are as follows:
The X (external buffer) bit of the buffer descriptors status-and-control word is
reserved in QH302.
The LG (Rx frame length violation) indication bit of the buffer descriptor status-
and-control word is not supported by the QH302.
BISYNC and DDCMP protocols are not supported by the QH302.
The SCC data synchronization register (DSR) no longer exists.
A part of the B2-channel parameters swap RAM position with the D-channel
parameters when the B2 channel is enabled. The parameter positions swap back
once B2 is disabled.
The HDLC-speciTc parameter RAM of a B channel occupies a larger address space
in the QH302.
2.1 Dual-Port RAM Map
The QH302 internal 1176-byte dual-port RAM has 576 bytes of usable system RAM and
576 bytes of parameter RAM.
The system RAM map of the QH302 is unchanged. It may be used to hold special RAM
microcode packages, buffer descriptor tables, or other user-deTned structures. Table 1
shows the system RAM map.
The parameter RAM map, on the other hand, has changed. In non-QH (3-channel) mode,
the mapping change accounts for QH302-speciTc global parameters and more exible
buffer descriptor placement. In QH mode, the QH protocol remaps the parameter RAM to
accommodate the four serial channels.
Table 1. System RAM Map
Base
1
Offset
Width
Description
000–0x23F
576 bytes
User data memory, microcode, and buffer descriptors
0x240–0x3FF
Reserved—not implemented
Note:
1
As defined in the BAR (base address register).
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