Brother HL-1260 User Manual

Page 140

III -

The attached Printer SIMM map shows the memory map for 2 SIMMs combined.

(6) ROM block

ROMs store the CPU control program and font data. ROMs are two 16Mbit masked ROMs and
two 8Mbit masked ROMs.

Optional sockets are available for two 8Mbit EPROM (µPD27C8000DZ-120 - NEC or equiva-
lent) for expansion.

ROM access time should be less than 120nsec.

8Mbit EPROMs can be used instead of a 16Mbit masked ROM.

(7) DRAM block

DRAMs are used for receiving buffer or working area of the CPU. The DRAM block contains
four 4Mbit DRAMs, thus having 2MB memory capacity in total.

The refreshing method is CBR (Cas Before Ras).

DRAM access time should be less than 80nsec.

$0000-0000

$003F-FFFF

$0040-0000

$0060-0000

$007F-FFFF

$1C00-0000

$1CFF-FFFF

$0400-0000

$0410-0000

$0800-0000

$0C00-0000

$1000-0000

$13C0-0000

$13E0-0000

$1400-0000

$1800-0000

$1C00-0000

$1D00-0000

$1F00-0000

$1FFF-FFFF

$1E00-0000

ROMOA, OB, 1A, 1B

Program ROM

(4MB)

Font ROM (2MB)

Optional ROM (2MB)

SELROM0(External battery terminal)

SELROM1(External battery termial)

ROM1B

Not used

MIO

MIO-EOT

(64 MB)

(64MB)

SIMM

(max64MB)

Reserve

(64MB)

ASIC internal register

Gate Array (16MB)

CDCC read buffer

BOOT-ROM

IRASO

Not used

Built-in RAM2MB

Soft Support Function

Timer

Serial

CDCC

MED Relation

Not used

HRC/GSC

Memory Wait Control

Interrupt control

Interrupt mask

Memory bank

LSB control

LSB setting

CPU write for LSB

Not used

Figure 3.2 Memory Map