Electrical Specifications
Table 5−34. HPI8 Mode Switching Characteristics
PARAMETER
MIN
MAX
UNIT
t
Enable time, HD driven from DS low
0
10
ns
en(DSL-HD)
Case 1a: Memory accesses when DMAC is active
18P+10−t
36P+10−t
10
w(DSH)
†
in 16-bit mode and t
< I8H
w(DSH)
Case 1b: Memory accesses when DMAC is active
w(DSH)
†
in 32-bit mode and t
≥ I8H
w(DSH)
Case 1c: Memory accesses when DMAC is active
†
in 16-bit mode and t
≥ I8H
w(DSH)
Delay time, DS low to HD valid
for first byte of an HPI read
Case 1d: Memory accesses when DMAC is active
t
ns
d(DSL-HDV1)
10
†
in 32-bit mode and t
≥ I8H
w(DSH)
Case 2a: Memory accesses when DMAC is inactive
10P+15−t
10
w(DSH)
†
and t
< 10H
w(DSH)
Case 2b: Memory accesses when DMAC is inactive
†
and t
≥ 10H
w(DSH)
Case 3: Register accesses
10
10
t
t
t
t
Delay time, DS low to HD valid for second byte of an HPI read
Hold time, HD valid after DS high, for a HPI read
Valid time, HD valid after HRDY high
ns
ns
ns
ns
d(DSL-HDV2)
h(DSH-HDV)R
v(HYH-HDV)
d(DSH-HYL)
2
2
8
‡
Delay time, DS high to HRDY low
Case 1a: Memory accesses when DMAC is active
in 16-bit mode
18P+6
36P+6
†
Case 1b: Memory accesses when DMAC is active
Delay time, DS high to HRDY
high
t
†
ns
d(DSH-HYH)
in 32-bit mode
‡
†
Case 2: Memory accesses when DMAC is inactive
10P+6
§
Case 3: Write accesses to HPIC register
6P+6
6
9
6
ns
ns
ns
t
t
t
Delay time, HCS low/high to HRDY low/high
Delay time, CLKOUT high to HRDY high
Delay time, CLKOUT high to HINT change
d(HCS-HRDY)
d(COH-HYH)
d(COH-HTX)
Delay time, CLKOUT high to HDx output change. HDx is configured as
general-purpose output
a
t
5
ns
d(COH-GPIO)
†
DMAC stands for direct memory access controller (DMAC). The HPI8 shares the internal DMA bus with the DMAC, thus HPI8 access times
are affected by DMAC activity.
The HRDY output is always high when the HCS input is high, regardless of DS timings.
This timing applies when writing a one to the DSPINT bit or HINT bit of the HPIC register. All other writes to the HPIC occur asynchronously,
and do not cause HRDY to be deasserted.
‡
§
101
November 2001 − Revised April 2004
SPRS007D
TI [ TEXAS INSTRUMENTS ]
