TMS320VC5407 datasheet(93/110 Pages) TI

93 / 110 page

Electrical Specifications

November 2001 − Revised April 2004

SPRS007D

Table 5−22. McBSP

Transmit and Receive Switching Characteristics†

PARAMETER

MIN

MAX

UNIT

tc(BCKRX)

Cycle time, BCLKR/X

BCLKR/X int

4P‡

tw(BCKRXH)

Pulse duration, BCLKR/X high

BCLKR/X int

D − 1§

D + 1§

tw(BCKRXL)

Pulse duration, BCLKR/X low

BCLKR/X int

C − 1§

C + 1§

Delay time BCLKR high to internal BFSR valid

BCLKR int

− 3

td(BCKRH-BFRV)

Delay time, BCLKR high to internal BFSR valid

BCLKR ext

Delay time BCLKX high to internal BFSX valid

BCLKX int

− 1

td(BCKXH-BFXV)

Delay time, BCLKX high to internal BFSX valid

BCLKX ext

Disable time, BCLKX high to BDX high impedance following last data

BCLKX int

tdis(BCKXH-BDXHZ)

Disable time, BCLKX high to BDX high impedance following last data

bit of transfer

BCLKX ext

Delay time BCLKX high to BDX valid

DXENA 0#

BCLKX int

− 1¶

td(BCKXH-BDXV)

Delay time, BCLKX high to BDX valid

DXENA = 0#

BCLKX ext

Delay time, BFSX high to BDX valid

BFSX int

−1¶

td(BFXH-BDXV)

Delay time, BFSX high to BDX valid

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

BFSX ext

† CLKRP = CLKXP = FSRP = FSXP = 0. If the polarity of any of the signals is inverted, then the timing references of that signal are also inverted.

‡ P = 0.5 * processor clock

§ T = BCLKRX period = (1 + CLKGDV) * 2P

C = BCLKRX low pulse width = T/2 when CLKGDV is odd or zero and = (CLKGDV/2) * 2P when CLKGDV is even

D = BCLKRX high pulse width = T/2 when CLKGDV is odd or zero and = (CLKGDV/2 + 1) * 2P when CLKGDV is even

¶ Minimum delay times also represent minimum output hold times.

# The transmit delay enable (DXENA) feature of the McBSP is not implemented on the TMS320VC5407/TMS320VC5404.

Bit(n-1)

(n-2)

(n-3)

BCLKR

BFSR (int)

BFSR (ext)

BDR

tw(BCKRXH)

tc(BCKRX)

tw(BCKRXL)

td(BCKRH-BFRV)

tsu(BFRH-BCKRL)

th(BCKRL-BFRH)

th(BCKRL-BDRV)

tsu(BDRV-BCKRL)

tr(BCKRX)

tf(BCKRX)

Figure 5−21. McBSP Receive Timings

TMS320VC5407 Datasheet(PDF) 93 Page - Texas Instruments

TMS320VC5407 Datasheet(HTML) 93 Page - Texas Instruments

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