Texas Instruments TMS320C6000 Manual page 15

Table A–3. TMS320C64x Host Port Timing Specifications
Symbol
t Setup time, select signals
su(SELV-HSTBL)
t Hold time, select signals
h(HSTBL-SELV)
t Pulse duration, HSTROBE
w(HSTBL)
t Pulse duration, HSTROBE
w(HSTBH)
t Setup time, host data valid before HSTROBE
su(HDV-HSTBH)
t Hold time, host data valid after HSTROBE
h(HSTBH-HDV)
Hold time, HSTROBE
t
h(HRDYL-HSTBL)
until HRDY is active (low); otherwise, HPI writes will not complete properly.
t Delay time, HCS to HRDY
d(HCS-HRDY)
t Delay time, HSTROBE low to HRDY high
d(HSTBL-HRDYH)
t Output hold time, HD low impedance after HSTROBE
oh(HSTBL-HDLZ)
t Delay time, HD valid to HRDY low
d(HDV-HRDYL)
t Output hold time, HD valid after HSTROBE
oh(HSTBH-HDV)
t Delay time, HSTROBE
d(HSTBH-HDHZ)
t Delay time, HSTROBE
d(HSTBL-HDV)
t Delay time, HSTROBE
d(HSTBH-HRDYH)
† HSTROBE refers to the following logical operation on HCS, HDS1, and HDS2: [NOT(HDS1 XOR HDS2)] OR HCS.
‡ P = 1/CPU clock frequency in ns. For example, when running parts at 200 MHz, use P = 5 ns.
§ Select signals include: HCNTRL[1:0], HR/W, and HHWIL.
¶ HCS enables HRDY, and HRDY is always low when HCS is high. The case where HRDY goes high when HCS falls indicates that HPI is busy
completing a previous HPID write or READ with autoincrement.
# This parameter is used during an HPID read. At the beginning of the first half-word transfer on the falling edge of HSTROBE, the HPI sends the
request to the DMA auxiliary channel, and HRDY remains high until the DMA auxiliary channel loads the requested data into HPID.
|| This parameter is used after the second half-word of an HPID write or autoincrement read. HRDY remains low if the access is not an HPID write
or autoincrement read. Reading or writing to HPIC or HPIA does not affect the HRDY signal.
NOTE: The timing specifications above are preliminary and the actual numbers may vary with a TMS part. Please refer to the latest data sheet
for numbers.
The timing requirements in the tables above are provided for quick reference only. For detailed
description, notes, and restrictions, please see the data sheets listed in the section.
Characteristic
§
†
valid before HSTROBE
§ †
valid after HSTROBE low
†
low
†
high between consecutive accesses
†
high
†
high
†
low after HRDY low. HSTROBE
¶
#
†
high
†
high to HD high impedance
†
low to HD valid
† ||
high to HRDY high
TMS320C6000 Host Port to MC68360 Interface
low
†
should not be inactivated
†
low for an HPI read
SPRA545A
Min Max
(ns) (ns)
5
2
‡
4P
‡
4P
5
2
2
1 7
3 12
2
‡
2P – 6
3
12
12
3 12
15