Network Router User Manual

TMS380C26 NETWORK COMMPROCESSOR SPWS010A–APRIL 1992–REVISED MARCH 1993
70
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PARAMETER MEASUREMENT INFORMATION
214
AddressDataAddress
Extended
Address
Valid
Low
(High)
SDDIR
SDBEN
(see Note A)
SRDY
SADH0–SADH7,
SADL0–SADL7,
SPH, SPL
(see Note C)
SALE
SXAL
SRD
(see Note A)
SWR
SBHE
(see Note B)
SRAS
SBCLK
212
233
212
212
218
217
218
226
227R 223R
231
207a
205
247
†
208a
208b
225R
229
237R
215
216
217
216
V
TWAIT
T1T4T3T1TXT4
HI-Z
215
207b
216a
233
218
206
T2
†
If parameter 208A is not met then valid data must be present before SRDY goes low.
NOTES: A. Motorola-style bus slaves hold SDTACK
active until the bus master deasserts SAS.
B. In 8-bit 80x8x mode, SBHE
/SRNW is a don’t care input during DIO and an inactive (high) output during DMA.
C. In 8-bit 80x8x mode, the most significant byte of the address is maintained on SADH for T2, T3, and T4. The address is maintained according to parameter 21; i.e., held
after T4 high.
Figure 33. 80x8x Mode DMA Read Timing