TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

Table 7-56. Switching Characteristics for Host-Port Interface Cycles(1) (2)

(see Table 7-56through Figure 7-51)

NO.

PARAMETER

-720 -850

-1000

UNIT

 

MIN

MAX

1td(HSTBL-HDV)

Delay time, HSTROBE low to DSP data valid

Case 1. HPIC or HPIA read

Case 2. HPID read with no auto-increment(3)

Case 3. HPID read with auto-increment and read FIFO initially empty(3)

Case 4. HPID read with auto-increment and data previously prefetched into the read FIFO

5

15

 

 

9 * M + 20

 

 

9 * M + 20

ns

5

15

 

2tdis(HSTBH-HDV)

3ten(HSTBL-HD)

4td(HSTBL-HRDYH)

5td(HSTBH-HRDYH)

6td(HSTBL-HRDYL)

Disable time, HD high-impedance from HSTROBE high

Enable time, HD driven from HSTROBE low

Delay time, HSTROBE low to HRDY high

Delay time, HSTROBE high to HRDY high

 

Case 1.

HPID read with no

Delay time, HSTROBE low to

auto-increment(3)

HRDY low

Case 2.

HPID read with auto-increment

 

and read FIFO initially empty(3)

1

4

ns

3

15

ns

 

12

ns

 

12

ns

 

10 * M + 20

 

 

 

ns

 

10 * M + 20

 

7td(HDV-HRDYL)

34td(DSH-HRDYL)

35td(HSTBL-HRDYL)

36td(HASL-HRDYH)

Delay time, HD valid to HRDY low

Case 1. HPIA write(3)

Delay time, HSTROBE high to

HRDY lowCase 2. HPID write with no auto-increment(3)

Delay time, HSTROBE low to HRDY low for HPIA write and FIFO not empty(3)

Delay time, HAS low to HRDY high

0

 

ns

5

* M + 20

 

5

* M + 20

ns

 

40

* M + 20

ns

 

12

ns

PRODUCT PREVIEW

(1)M = SYSCLK3 period = 6/CPU clock frequency in ns. For example, when running parts at 1000 MHz, use M = 6 ns.

(2)HSTROBE refers to the following logical operation on HCS, HDS1, and HDS2: [NOT(HDS1 XOR HDS2)] OR HCS.

(3)Assumes the HPI is accessing L2/L1 memory and no other master is accessing the same memory location.

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C64x+ Peripheral Information and Electrical Specifications

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Texas Instruments TMS320C6454 warranty See -56through Figure