External Memory Interface (Emif) Advisories; Ardy Pin Requires Strong Pullup Resistor; External Memory Write After Read Reversal - Texas Instruments TMS320VC5509A Manual

TMS320VC5509A Silicon Errata
3.5

External Memory Interface (EMIF) Advisories

Advisory EMIF_8
Revision(s) Affected:
Details:
Assembler Notification: None
Workaround:
Advisory EMIF_9
Revision(s) Affected:
Details:
Assembler Notification: None
Workaround:
1.0 and 1.1
When the parallel bus is used to access external memory, a strong pullup resistor is required
for the ARDY pin for the asynchronous memory interface.
Pull up ARDY with a 2.2-kΩ resistor.
1.0 and 1.1
If an external memory write is followed immediately by an external memory read, the external
memory read will occur first, followed by the write. See the example below.
Example:
MOV #1770h, *(100001h)
MOV *(#100000h), AR1
Insert two NOPs between the memory write/read pair.
Example:
MOV #1770h, *(100001h)
NOP
NOP
MOV *(#100000h), AR1

ARDY Pin Requires Strong Pullup Resistor

External Memory Write After Read Reversal

; External Memory Write
; External Memory Read
; External Memory Write
; External Memory Read
SPRZ200E
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