Network Router User Manual

TMS380C26
NETWORK COMMPROCESSOR
SPWS010A–APRIL 1992–REVISED MARCH 1993
POST OFFICE BOX 1443 • HOUSTON, TEXAS
77251–1443
62
PARAMETER MEASUREMENT INFORMATION
(High)
Output Data Valid
Valid (see Note A)Valid
SADH0–SADH7,
SADL0–SADL7,
SPH, SPL
(see Note B)
SRDY
†
SDBEN
SDDIR
SRD
SWR
SIACK
SRAS
SCS
, SRSX,
SRS0–SRS2,
SBHE
261
261a
255
275
283R
272a
267
273a
266a
256
268265
264
HI-Z
HI-ZHI-Z
HI-Z
282a
260
272a
272a
286
273a
273a
282R
279
259
†
When the TMS380C26 begins to drive SDBEN inactive, it has already latched the write data internally. Parameter 263 must be met to the input
of the data buffers.
NOTES: A. In 80x8x mode, SRAS may be used to strobe the values of SBHE
, SRSX, SRS0–SRS2, and SCS. When used to do so, SRAS must
meet parameter 266a, and SBHE
, SRS0–SRS2, and SCS must meet parameter 264. If SRAS is strapped high, then parameters
266a and 264 are irrelevant, and parameter 268 must be met.
B. In 8-bit 80x8x mode DIO reads, the SADH0–SADH7 contain don’t care data.
Figure 28. 80x8x DIO Read Timing