Rainbow Electronics AT91CAP9S250A - Manual (Page 208)

208
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
22.14.3 SMC Cycle Register
Register Name: SMC_CYCLE[0.. 5 ]
Access Type: Read/Write
• NWE_CYCLE: Total Write Cycle Length
The total write cycle length is the total duration in clock cycles of the write cycle. It is equal to the sum of the setup, pulse
and hold steps of the NWE and NCS signals. It is defined as:
Write cycle length = (NWE_CYCLE[8:7]*256 + NWE_CYCLE[6:0]) clock cycles
• NRD_CYCLE: Total Read Cycle Length
The total read cycle length is the total duration in clock cycles of the read cycle. It is equal to the sum of the setup, pulse
and hold steps of the NRD and NCS signals. It is defined as:
Read cycle length = (NRD_CYCLE[8:7]*256 + NRD_CYCLE[6:0]) clock cycles
31 30 29 28 27 26 25 24
– – – – – – – NRD_CYCLE
23 22 21 20 19 18 17 16
NRD_CYCLE
15 14 13 12 11 10 9 8
– – – – – – – NWE_CYCLE
7 6 5 4 3 2 1 0
NWE_CYCLE