Analog Devices SHARC ADSP-21368 User Manual

SDRAM Controller
3-72 ADSP-21368 SHARC Processor Hardware Reference
commands with no effect, the
NOP command is given. When the SDC is
not accessing any SDRAM external banks, the command inhibit com-
mand is given.
A summary of pin states during SDC commands appears in Table 3-26.
Note that an X means do not care.
Table 3-26. SDRAM Pin States During SDC Commands
Command SDCKE
(n-1)
SDCKE
(n)
MS3–0 SDRAS SDCAS SDWE SDA10 Addresses
Mode register
set
High High Low Low Low Low Opcode Opcode
Activate High High Low Low High Low Valid Valid
Read High High Low High Low High Low Valid
Single
Precharge
High High Low Low High Low Low Valid
Precharge all High High Low Low High Low High X
Write High High Low High Low Low Low Valid
Auto-refresh High High Low Low Low High X X
Self-refresh
entry
High Low Low Low Low High X X
Self-refreshLowLowXXXXX X
Self-refresh
exit
LowHighHighXXXX X
Burst Stop High High Low High High Low X X
Nop High High Low High High High X X
Inhibit High High High X X X X X

Analog Devices SHARC ADSP-21368 Specifications

General

Brand	Analog Devices
Model	SHARC ADSP-21368
Category	Computer Hardware
Language	English