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参数资料
型号： MC68302CRC16C
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, CPGA132
封装： PGA-132
文件页数： 37/128页
文件大小： 641K
代理商： MC68302CRC16C
Introduction
MOTOROLA
MC68EN302 REFERENCE MANUAL
1-3
in the MC68EN302. The BAR register is identical to the MC68302 BAR, and the Module
Controller Base Address Register is specific to the MC68EN302.
1.3.1 Module Controller Base Address Register (MOBAR) Address ($EE)
The Module Controller Base Address Register (MOBAR) sets the base address for the
MC68EN302 registers which are in addition to the register set of the MC68302. The MOBAR
is located at address $0EE and its configuration and operation match the existing MC68302
BAR. The value of MOBAR after reset defaults to $BFFE which places the Module Controller
Block directly below the MC68302 Block. The MC68EN302 must be in supervisor mode for
MOBAR to be written with a new value.
FC2–FC0—Function Code 2–Function Code 0
FC2-0 sets the address space of the 4 kbyte Module Controller Block. Depending
on the value of the CFC bits, the MC68EN302 address compare logic uses these
bits to cause an address match within its address space.DO NOT assign FC2-0
to the M68000 interrupt acknowledge space (FC2-0 = 111b).
CFC—Compare Function Code
When cleared, the FC bits in the MOBAR are ignored and accesses to the Module
Controller Block occur without comparing the FC bits. When set, the address
space compare logic uses the FC bits in MOBAR to detect address matches.
MOBA—Module Controller Base Address.
The high address field is contained in bits 11-0 of the MOBAR and sets the
starting address of the Module Controller Block.
1.4 REGISTER OVERVIEW
The control and status registers for the Ethernet controller are all 16 bits with an address
range of MOBA+$000 to MOBA+$FFF. The MC68EN302 registers in addition to the 302
register set are shown in Table 1-1. Note that even though the entire 302 register set is
provided, special care must be taken when initializing the pre-existing 302 registers so there
are no contention or compatibility issues during internal arbitration. The registers that
require particular attention are:
OR
GIMR
SCR.
Also, notice that DTACK is not returned for accesses to unimplemented CSRs in the MOBA
address space.
15
14
13
12
11
10
9876543210
FC2
FC0
CFC
BA23 BA22 BA21 BA20 BA19 BA18 BA17 BA16 BA15 BA14 BA13 BA12
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