Intel 386 User Manual

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
D-18
D.13 DMAGRPMSK
DMA Group Channel Mask
DMAGRPMSK
(read/write)
Expanded Addr:
ISA Addr:
Reset State:
F00FH
000FH
03H
7 0
———— ——HRM1HRM0
Bit
Number
Bit
Mnemonic
Function
7–2 — Reserved. These bits are undefined; for compatibility with future devices,
do not modify these bits.
1 HRM1 Hardware Request Mask 1:
0 = Channel 1’s hardware requests are not masked.
1 = Masks (disables) channel 1’s hardware requests. When this bit is
set, channel 1 can still receive software requests.
0 HRM0 Hardware Request Mask 0:
0 = Channel 0’s hardware requests are not masked.
1 = Masks (disables) channel 0’s hardware requests. When this bit is
set, channel 0 can still receive software requests.

Intel 386 Specifications

General

Architecture	x86
Clock Speed	12 MHz to 40 MHz
Transistor Count	275, 000
Data Bus Width	32-bit
Address Bus Width	32-bit
Instruction Set	x86
Introduced	1985
Maximum Memory	4 GB
Operating Modes	Real mode, Protected mode, Virtual 8086 mode
MMU	Yes
Voltage	5V
Model	Intel 386
Package	PGA
Process	1.5 μm to 1 μm