TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

Table 7-60. Switching Characteristics Over Recommended Operating Conditions for McBSP

(see Figure 7-52) (continued)

NO.

3 tw(CKRX)

4td(CKRH-FRV)

9td(CKXH-FXV)

12tdis(CKXH-DXHZ)

13td(CKXH-DXV)

14td(FXH-DXV)

PARAMETER

Pulse duration, CLKR/X high or CLKR/X low

Delay time, CLKR high to internal FSR valid

Delay time, CLKX high to internal FSX valid

Disable time, DX high impedance following last data bit from CLKX high

Delay time, CLKX high to DX valid

Delay time, FSX high to DX valid

ONLY applies when in data delay 0 (XDATDLY = 00b) mode

-720 -850

 

-1000

 

 

UNIT

 

 

 

 

 

MIN

 

MAX

 

CLKR/X int

C – 1(7)

 

C + 1(7)

ns

CLKR int

–2.1

 

3.3

ns

CLKX int

–1.7

 

3

ns

CLKX ext

1.7

 

9

 

 

CLKX int

–3.9

 

4

ns

CLKX ext

2.1

 

9

 

 

CLKX int

–3.9 + D1(8)

4

+ D2(8)

ns

CLKX ext

2.1 + D1(8)

9

+ D2(8)

 

FSX int

–2.3 + D1(9)

5.6

+ D2(9)

 

FSX ext

1.9 + D1(9)

9

+ D2(9)

ns

 

(7)C = H or L

S = sample rate generator input clock = 6P if CLKSM = 1 (P = 1/CPU clock frequency) S = sample rate generator input clock = P_clks if CLKSM = 0 (P_clks = CLKS period) H = CLKX high pulse width = (CLKGDV/2 + 1) * S if CLKGDV is even

H = (CLKGDV + 1)/2 * S if CLKGDV is odd

L = CLKX low pulse width = (CLKGDV/2) * S if CLKGDV is even L = (CLKGDV + 1)/2 * S if CLKGDV is odd

CLKGDV should be set appropriately to ensure the McBSP bit rate does not exceed the maximum limit (see (4) above).

(8)Extra delay from CLKX high to DX valid applies only to the first data bit of a device, if and only if DXENA = 1 in SPCR. if DXENA = 0, then D1 = D2 = 0

if DXENA = 1, then D1 = 6P, D2 = 12P

(9)Extra delay from FSX high to DX valid applies only to the first data bit of a device, if and only if DXENA = 1 in SPCR. if DXENA = 0, then D1 = D2 = 0

if DXENA = 1, then D1 = 6P, D2 = 12P

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