SAM3S8B Atmel Corporation, SAM3S8B Datasheet - Page 387

• Manufacturer Part Number: SAM3S8B
• Manufacturer: Atmel Corporation

23.8.3.3
23.8.3.4
Figure 23-10. Null Setup and Hold Values of NCS and NWE in Write Cycle
23.8.3.5
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
Null Delay Setup and Hold
Null Pulse
Write Cycle
A [23:0]
D[7:0]
NWE
MCK
NCS
The write_cycle time is defined as the total duration of the write cycle, that is, from the time
where address is set on the address bus to the point where address may change. The total write
cycle time is equal to:
NWE_CYCLE = NWE_SETUP + NWE_PULSE + NWE_HOLD
= NCS_WR_SETUP + NCS_WR_PULSE + NCS_WR_HOLD
All NWE and NCS (write) timings are defined separately for each chip select as an integer num-
ber of Master Clock cycles. To ensure that the NWE and NCS timings are coherent, the user
must define the total write cycle instead of the hold timing. This implicitly defines the NWE hold
time and NCS (write) hold times as:
NWE_HOLD = NWE_CYCLE - NWE_SETUP - NWE_PULSE
NCS_WR_HOLD = NWE_CYCLE - NCS_WR_SETUP - NCS_WR_PULSE
If null setup parameters are programmed for NWE and/or NCS, NWE and/or NCS remain active
continuously in case of consecutive write cycles in the same memory (see
ever, for devices that perform write operations on the rising edge of NWE or NCS, such as
SRAM, either a setup or a hold must be programmed.
Programming null pulse is not permitted. Pulse must be at least set to 1. A null value leads to
unpredictable behavior.
NCS_WR_PULSE
NWE_CYCLE
NWE_PULSE
NCS_WR_PULSE
NWE_PULSE
NWE_CYCLE
NCS_WR_PULSE
NWE_CYCLE
NWE_PULSE
SAM3S8/SD8
SAM3S8/SD8
Figure
23-10). How-
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