Datasheet

–27–REV. A
ADSP-2191M
Host Port ACC Mode Write Cycle Timing
Table 16 and Figure 15 describe Host port write operations in
Address Cycle Control (ACC) mode. For more information on
ACK, Ready, ALE, and ACC mode selection, see the Host port
modes description on Page 8.
Table 16. Host Port ACC Mode Write Cycle Timing
Parameter Min Max Unit
Switching Characteristics
t
WHKS1
HWR Asserted to HACK Asserted (ACK Mode) First Byte 10 5t
HCLK
+t
NH
1
ns
t
WHKS2
HWR Asserted to HACK Asserted (Setup, ACK Mode)
2
12 ns
t
WHKH
HWR Deasserted to HACK Deasserted (Hold, ACK Mode) 10 ns
t
WHS
HWR Asserted to HACK Asserted (Setup, Ready Mode) 10 ns
t
WHH
HWR Asserted to HACK Deasserted (Hold, Ready Mode)
First Byte
05t
HCLK
+t
NH
1
ns
t
WSHKS
HWR Asserted to HACK Asserted (Setup) During Address
Latch
10 ns
t
WHHKH
HWR Deasserted to HACK Deasserted (Hold) During
Address Latch
10 ns
Timing Requirements
t
WAL
HWR Asserted to HALE Deasserted (Delay) 1.5 ns
t
CSAL
HCMS or HCIOMS Asserted to HALE Asserted (Delay) 0ns
t
ALCS
HALE Deasserted to Optional HCMS or HCIOMS
Deasserted
1ns
t
WCSW
HWR Deasserted to HCMS or HCIOMS Deasserted 0 ns
t
ALW
HALE Asserted to HWR Asserted 0.5 ns
t
CSW
HCMS or HCIOMS Asserted to HWR Asserted 0ns
t
WCS
HWR Deasserted (After Last Byte) to HCMS or
HCIOMS Deasserted (Ready for Next Write)
0ns
t
ALEW
HALE Deasserted to HWR Asserted 1 ns
t
HKWD
HACK Asserted to HWR Deasserted (Hold, ACK Mode) 1.5 ns
t
ADW
Address Valid to HWR Asserted (Setup) 3 ns
t
WAD
HWR Deasserted to Address Invalid (Hold) 3 ns
t
DWS
Data Valid to HWR Deasserted (Setup) 2 ns
t
WDH
HWR Deasserted to Data Invalid (Hold) 2 ns
t
HKWAL
HACK Asserted to HWR Deasserted (Hold) During Address
Latch
2
2ns
1
t
NH
are peripheral bus latencies (nⴛt
HCLK
); these are internal DSP latencies related to the number of peripheral DMAs attempting to access DSP memory
at the same time.
2
Measurement is for the second, third, or fourth byte of a host write transaction. The quantity of bytes to complete a host write transaction is dependent
on the data bus size (8 or 16 bits) and the data type (16 or 24 bits).