Texas Instruments TMS320C6000 Manual page 14

SPRA545A
Table A–2. TMS320C6211/C6711 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 low
w(HSTBL)
t Pulse duration, HSTROBE high between consecutive accesses
w(HSTBH)
t Setup time, host data valid before HSTROBE high
su(HDV-HSTBH)
t Hold time, host data valid after HSTROBE high
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
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 high
oh(HSTBH-HDV)
t Delay time, HSTROBE high to HD high impedance
d(HSTBH-HDHZ)
t Delay time, HSTROBE low to HD valid
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.
14 TMS320C6000 Host Port to MC68360 Interface
Characteristic
§
valid before HSTROBE low
§
valid after HSTROBE low
†
†
†
†
low after HRDY low. HSTROBE
¶
† #
low to HRDY high
†
†
† ||
high to HRDY high
†
†
†
†
should not be inactivated
†
low for an HPI read
†
Min Max
(ns) (ns)
5
4
‡
4P
‡
4P
5
3
2
1 15
3 15
2
‡ ‡
2P – 4 2P
3 15
3 15
3 15
3 15