
Map and Paging Control Register
Map and Paging Control Register
MPCR (READ/WRITE) 00E3H (or 01E3h via CMOS Setup)
D7 D6 D5 D4 D3 D2 D1 D0
FPGEN
DOCEN1
DOCEN0
SB-SEL
VB-SEL
PG2 PG1 PG0
Table 22: Map and Paging Control Register Bit Assignments
Bit Mnemonic Description
D7 FPGEN
FLASH Paging Enable — Enables a 64K page frame from E0000h to
EFFFFh. Used to gain access to the on-board FLASH memory.
FPGEN = 0
FLASH page frame disabled.
FPGEN = 1
FLASH page frame enabled.
D6-D5 DOCEN1-
DOCENO
DiskOnChip Enable — Enables a 8K page frame used to gain access to the
Disk on Chip.
Memory Range within
PG2
PG1 DiskOnChip
0 0
Disabled
0
1
D000:0
1
0
D800:0
1
1
DE00:0
D4 SB-SEL
System BIOS Selection — Indicates the status of jumper VS2[1-2].
SB-SEL = 0
Jumper out, Secondary System BIOS selected.
SB-SEL = 1
Jumper in, Primary System BIOS selected.
Note! This is a read-only bit
D3 VB-SEL
Video BIOS Selection — Indicates the status of jumper VS2[3-4].
VB-SEL = 0
Jumper out, Secondary System BIOS selected.
VB-SEL = 1
Jumper in, Primary System BIOS selected.
Note! This is a read-only bit
D2-D0 PG2-PG0 Page Select — Selects which 64K block of FLASH will be mapped into the page
frame at E0000h to EFFFFh
Memory Range within
PG2
PG1 PG0
FLASH
0 0 0 000000h
to
00FFFFh
0 0 1 010000h
to
01FFFFh
0 1 0 020000h
to
02FFFFh
0 1 1 030000h
to
03FFFFh
1 0 0 040000h
to
04FFFFh
1 0 1 050000h
to
05FFFFh
1 1 0 060000h
to
06FFFFh
1 1 1 070000h
to
07FFFFh
44 – Reference
EPM-CPU-10 Reference Manual