Rev. 2.00, 09/03, page 150 of 690
•
Bus arbitration
Shares all of the resources with other CPU and outputs the bus enable after receiving the
bus request from external devices.
7.1.2
Block Diagram
BSC functional block diagram is shown in figure 7.1.
Output
signal drive
controller
Wait between
access cycles
controller
Wait
controller
Memory
controller
Refresh
controller
Address/data
controller
Area
controller
CMNCR
CSnBCR
*
CSnWCR
*
SDCR
RTCSR
RTCNT
RTCOR
Comparator
CS0
,
CS2
,
CS3
,
CS4
,
CS5A
,
CS5B
,
CS6A
,
CS6B
BS
,
RD
, RD/
WR
,
WE3
to
WE0
,
RASU
,
RASL
,
CASU
,
CASL
,
AH
, CKE, DQMUU, DQMUL,
DQMLU, DQMLL
WAIT
A25 to 0
D31 to 0
Internal
address bus
Internal
data bus
Note:
*
CSnBCR, CSnWCR : n = 0, 2, 3, 4, 5A, 5B, 6A, 6B
Legend:
CSnBCR
: Area n bus control register
CSnWCR
: Area n wait control register
SDCR
: SDRAM control register
RTCSR
: Refresh timer control/status register
RTCNT
: Refresh timer counter
RTCOR
: Refresh timer constant register
BSC
Figure 7.1 BSC Functional Block Diagram
Содержание SH7705
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