TMS320C6711 datasheet(100/129 Pages) TI

100 / 129 page

TMS320C6711, TMS320C6711B, TMS320C6711C, TMS320C6711D

FLOATING-POINT DIGITAL SIGNAL PROCESSORS

SPRS088L − FEBRUARY 1999 − REVISED MAY 2004

100

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

HOST-PORT INTERFACE TIMING (CONTINUED)

switching characteristics over recommended operating conditions during host-port interface

cycles†‡ (see Figure 46, Figure 47, Figure 48, and Figure 49) [C6711C/C6711D]

NO.

PARAMETER

11CGDPA-167

11C−200

11DGDPA-167

11D−200

11D−250

UNIT

MIN

MAX

MIN

MAX

td(HCS-HRDY)

Delay time, HCS to HRDY§

td(HSTBL-HRDYH) Delay time, HSTROBE low to HRDY high#

td(HSTBL-HDLZ)

Delay time, HSTROBE low to HD low impedance for an HPI read

td(HDV-HRDYL)

Delay time, HD valid to HRDY low

2P − 4

toh(HSTBH-HDV)

Output hold time, HD valid after HSTROBE high

td(HSTBH-HDHZ)

Delay time, HSTROBE high to HD high impedance

td(HSTBL-HDV)

Delay time, HSTROBE low to HD valid

3 10P + 5.8

12.5

td(HSTBH-HRDYH) Delay time, HSTROBE high to HRDY high||

† 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 250 MHz, use P = 4 ns.

§ 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.

¶ Make sure the external host meets the timing specifications of the C6711C device. Delays or buffers may be needed to compensate for any timing

differences. IBIS analysis should be used to correctly model the system interface.

# 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 EDMA internal address generation hardware, and HRDY remains high until the EDMA internal address generation hardware 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.

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