4
RAM area memory map
Fig. 5-4
In the three RAM chip select, the following address is decoded.
CS signal
Address
• RAS1
1C0000H~1DFFFFH
(008000H~00FE7FH)
*
Note
• RAS2
1E0000H~1FFFFFH
(008000H~00FE7FH)
*
Note
• RAS3
200000H~3FFFFFH
*
Base signal is for 2M.
*
Note: RAS1 signal is formed as OR in the image area of 0 page.j
(Lower 32KB).
RAS2 signal is formed as OR in the image area of 0 page.
(lower32KB).
5
I/O area memory map
Fig. 5-5
*
Note 1: MPCCS signal is the base signal for MPCA6 internal
registerdecoding, and does not exist as an internal signal.
*
Note 2: OPCCS1 and OPCCS2 signals are decoded in the OPC
(optionperipheral controller) using the base signal OPTCS
for optiondecoding. They does not exist as external sig-
nals.
2) Block diagram
Fig. 5-6
1
ROM control
Fig. 5-7
IPLON: IPL board detection signal incorporated in the option slot.
Note used in the ER-A460/A470. (Not used)
Access is performed with two ROM chip select signals ROS1 and
ROS2, which decode 512KB address area respectively to
accessmax. 4MB ROM.
2
RAM control
Fig. 5-8
Access is performed with two RAM chip select signals RAS1, RAS2
and RAS3. The control register in MPCA6 allows selection of
pageimage memory area. (RAS1 is selected for initializing.)
*
: For 0 page image area, selection between RAS1 and RAS2 can
bemade with the control register. The 0 page control
registerperforms initializing at the timing of no stack pro-
cessimmediately after resetting.
100000H
400000H
BFFFFFH
NOT USE
NOT USE
RAS1 32KB
RAS2 128KB
RAS3
(Not used)
1C0000H
1E0000H
200000H
00FF80H
00FFA0H
00FFFFH
MPCCS
NOT USE
NOT USE
NOT USE
NOT USE
OPCCS1
OPCCS2
00FFC0H
00FFD0H
00FFE0H
00FFF0H
(*1)
(*2)
(*2)
CPU
MPCA6
ROM1
RAM1
RAM2
(OPTION)
ROM2
(OPTION)
Data bus
Address bus
ROS1
ROS2
RAS1
RAS2
Address
A23~A14
(IPLON)
Address
decorder
C80000H~CFFFFFH
C00000H~C7FFFFH
000000H~007FFFH
MPCA5
ROS2
ROS1
Address
A23~A14
Address
decorder
1C0000H~1DFFFFH
008000H
~
00F7FFH
*1
1E0000H~1FFFFFH
RAS1
RAS2
RESET
D
CK
Q
R
DOI
S8F
Control register
MPCA5
– 22 –
Summary of Contents for ER-A460
Page 49: ...2 Main PWB layout 48 ...
Page 57: ...13 Keyboard PWB layout 56 ...
Page 60: ... Top cabinet etc ER A460 I 34 RCPSO082 2 ...
Page 62: ...ER A460V Top cabinet etc ER A470 RCPSO083 4 ...
Page 64: ... ER A460V 9 RCPSO084 6 ...