Analog Devices ADSP-BF535 Blackfin, Hardware Reference Manual

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ADSP-BF535 Blackfin Processor Hardware Reference 18-85
External Bus Interface Unit
When the external buffer timing (
EBUFE = 1
in the SDRAM Memory
Global Control register) and/or CAS latency of 3 (
CL = 11
in the SDRAM
Memory Global Control register) is used, all accesses take one extra cycle
for each feature selected. Accesses that hit in the Read Buffer follow these
rules:
If either
EBUFE = 1
or
CL = 11
:
• For N = 16 to 13, N half word hit: 8 words/8 cycles
• For N = 12 to 0, N half word hit: 8 words/(22 – N) cycles
If both
EBUFE = 1
and
CL = 11
:
• For N = 16 to 14, N half word hit: 8 words/8 cycles
• For N = 13 to 0, N half word hit: 8 words/(23 – N) cycles