Panasonic MN103001G/F01K User Manual Page 134

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Bus Controller (BC)
8-20
When using handshaking mode (Memory control register 3B B3WM = 1)
Bit No. Bit name Description Setting conditions
1 to 0 BCS1 to 0 DK detection wait cycle (used as parameter DW) 00: prohibited
01: 1MCLK
10: 2MCLK
11: 3MCLK
3 to 2 EA1 to 0 RE/WE assert timing 00: prohibited
01: 1MCLK
10: 2MCLK
11: 3MCLK
5 to 4 ADE1 to 0 Address output end timing 00: 0MCLK
11: 3MCLK
10 to 6 BCE4 to 0 Bus cycle end timing 00000: 0MCLK
Set so that:
BCE
REN, BCE WEN 11111: 31MCLK
15 to 11 REN4 to 0 RE negate timing 00000: 0MCLK
11111: 31MCLK
Note: Handshaking mode can only be set when (MCLK frequency/SYSCLK frequency) = 4.
If (MCLK frequency/SYSCLK frequency) = 1 or 2, set B3WM = 0 in MEMCTR3B.
When using fixed wait mode (Memory control register 3B B3WM = 0)
Bit No. Bit name Description Setting conditions
1 WM Block 3 wait mode 0: fixed wait mode
2 BM Block 3 bus mode 0: Synchronous mode (SYSCLK synchronization)
1: Asynchronous mode (MCLK synchronization)
4 BW Block 3 bus width 0: 8 bits
1: 16 bits
7 to 6 ASA1 to 0 AS assert timing 00: 0MCLK
11: 3MCLK
10 to 8 ASN2 to 0 AS negate timing 000: prohibited
Set so that: 001: 1MCLK
ASN ASA
111: 7MCLK
15 to 11 WEN4 to 0 WE negate timing Settings other than those shown below are prohibited.
Set so that: 00011: 3MCLK
WEN EA
11111: 31MCLK
~
~
~
~
~
~
Memory control register 3B
Register symbol: MEMCTR3B
Address: x32000026
Purpose: Sets the bus mode, access timing, etc., for external memory space block 3.
Bit No. 15 14 13 12 11 10 9876543210
Bit B3 B3 B3 B3 B3 B3 B3 B3 B3 B3
B3
B3 B3
name WEN4WEN3WEN2WEN1WEN0 ASN2 ASN1 ASN0 ASA1 ASA0 BW BM WM
Reset 1110101101010000
Access R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R R/W R R/W R/W R
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