HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 338

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Bus State Controller (BSC)
Note:
• CS2WCR, CS3WCR
Rev. 4.00 Sep. 14, 2005 Page 288 of 982
REJ09B0023-0400
Bit
1
0
Bit
31 to 21
20
19 to 11
*
Bit Name
HW1
HW0
Bit Name

BAS

To connect the burst ROM to the CS0 area and use the burst ROM interface after the
BSC is activated, enables the burst access through bit 20, specifies the number of burst
wait cycles through bits 17 and 16, and then set the bits TYPE[2:0] in CS0BCR.
Reserved bits other than above should not be set to 1.
For details on the burst ROM interface, see Burst ROM (Clock Asynchronous).
Initial
Value
0
0
Initial
Value
All 0
0
All 0
R/W
R/W
R/W
R/W
R
R/W
R
Description
Delay Cycles from RD, WEn Negation to Address, CSn
Negation
Specify the number of delay cycles from RD and WEn
negation to address and CSn negation.
00: 0.5 cycles
01: 1.5 cycles
10: 2.5 cycles
11: 3.5 cycles
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Byte-Selection SRAM Byte Access Selection
Specifies the WEn and RD/WR signal timing when the
byte-selection SRAM interface is used.
0: Asserts the WEn signal at the read timing and
1: Asserts the WEn signal during the read access cycle
Reserved
These bits are always read as 0. The write value
should always be 0.
asserts the RD/WR signal during the write access
cycle.
and asserts the RD/WR signal at the write timing.