Cypress CY7C67300 Manual De Usuario
CY7C67300
Document #: 38-08015 Rev. *J
Page 23 of 99
Memory Diagnostic Register [0xC03E] [W]
Register Description
The Memory Diagnostic register provides control of diagnostic
modes.
modes.
Memory Arbitration Select
(Bits[10:8])
The Memory Arbitration Select field is defined in
Monitor Enable
(Bit 0)
The Monitor Enable bit enables or disables monitor mode. In
monitor mode the internal address bus is echoed to the external
address pins.
monitor mode the internal address bus is echoed to the external
address pins.
1:
Enable monitor mode
0:
Disable monitor mode
Reserved
Write all reserved bits with ’0’.
External Memory Registers
There are four registers dedicated to controlling the external
memory interface. Each of these registers are covered in this
section and are summarized in
memory interface. Each of these registers are covered in this
section and are summarized in
.
Table 33. Memory Diagnostic Register
Bit #
15
14
13
12
11
10
9
8
Field
Reserved
Memory
Arbitration
Select
Read/Write
-
-
-
-
-
W
W
W
Default
0
0
0
0
0
0
0
0
Bit #
7
6
5
4
3
2
1
0
Field
Reserved
Monitor
Enable
Read/Write
-
-
-
-
-
-
-
W
Default
0
0
0
0
0
0
0
0
Table 34. Memory Arbitration Select
Memory Arbitration
Select [3:0]
Memory Arbitration Timing
111
1/8, 7 of every 8 cycles dead
110
2/8, 6 of every 8 cycles dead
101
3/8, 5 of every 8 cycles dead
100
4/8, 4 of every 8 cycles dead
011
5/8, 3 of every 8 cycles dead
010
6/8, 2 of every 8 cycles dead
001
7/8, 1 of every 8 cycles dead
000
8/8, all cycles available
Table 35. External Memory Control Registers
Register Name
Address
R/W
Extended Page 1 Map Register
0xC018
R/W
Extended Page 2 Map Register
0xC01A
R/W
Upper Address Enable Register
0xC038
R/W
External Memory Control Register
0xC03A
R/W