Rfsadd; Rfsbad; D.52 Rfsadd; D.53 Rfsbad - Intel 386 User Manual

Intel386™ EX EMBEDDED MICROPROCESSOR USER'S MANUAL

D.52 RFSADD

Refresh Address

RFSADD

(read/write)
15
— —
7
RA7 RA6
Bit Bit
Number Mnemonic
15–14 —
13–1 RA13:1
0 —

D.53 RFSBAD

Refresh Base Address

RFSBAD

(read/write)
15
— —
7
RA21 RA20
Bit Bit
Number Mnemonic
15–12 —
11–0 RA25:14
D-54
RA13 RA12
RA5 RA4
Reserved. These bits are undefined; for compatibility with future devices,
do not modify these bits.
Refresh Address Bits:
These bits comprise A13:1 of the refresh address.
Refresh Bit 0:
A0 of the refresh address. This bit is always 1 and is read-only.
— —
RA19 RA18
Reserved. These bits are undefined; for compatibility with future devices,
do not modify these bits.
Refresh Base:
These bits make up the A25:14 address bits of the refresh address. This
establishes a memory region for refreshing.
Expanded Addr: F4A6H
ISA Addr: —
Reset State: 00FFH
RA11 RA10
RA3 RA2
Function
Expanded Addr: F4A0H
ISA Addr: —
Reset State: 0000H
RA25 RA24 RA23
RA17 RA16 RA15
Function
8
RA9 RA8
0
RA1 1
8
RA22
0
RA14