AM1808AZCED3 datasheet(143/264 Pages) TI

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AM1808

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SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

Table 6-59. Switching Characteristics for McBSP0 [1.3V, 1.2V, 1.1V](1) (2)

(see Figure 6-32)

1.3V, 1.2V

1.1V

NO.

PARAMETER

UNIT

MIN

MAX

MIN

MAX

Delay time, CLKS high to CLKR/X high for internal

td(CKSH-CKRXH)

14.5

CLKR/X generated from CLKS input

2P or 20(3)

2P or 25(3)

tc(CKRX)

Cycle time, CLKR/X

CLKR/X int

(4) (5)

Pulse duration, CLKR/X high or

tw(CKRX)

CLKR/X int

C - 2(6)

C + 2(6)

C - 2(6)

C + 2(6)

CLKR/X low

CLKR int

-4

5.5

-4

5.5

Delay time, CLKR high to internal FSR

td(CKRH-FRV)

valid

CLKR ext

14.5

CLKX int

-4

5.5

-4

5.5

Delay time, CLKX high to internal FSX

td(CKXH-FXV)

valid

CLKX ext

14.5

CLKX int

-4

7.5

-5.5

7.5

Disable time, DX high impedance

tdis(CKXH-DXHZ)

following last data bit from CLKX high

CLKX ext

-2

-22

CLKX int

-4 + D1(7)

5.5 + D2(7)

-4 + D1(7)

5.5 + D2(7)

td(CKXH-DXV)

Delay time, CLKX high to DX valid

CLKX ext

2 + D1(7)

14.5 + D2(7)

2 + D1(7)

16 + D2(7)

Delay time, FSX high to DX valid

FSX int

-4(8)

5(8)

-4(8)

5(8)

td(FXH-DXV)

ONLY applies when in data

FSX ext

-2(8)

14.5(8)

-2(8)

16(8)

delay 0 (XDATDLY = 00b) mode

(1)

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

inverted.

(2)

Minimum delay times also represent minimum output hold times.

(3)

Minimum CLKR/X cycle times must be met, even when CLKR/X is generated by an internal clock source. Minimum CLKR/X cycle times

are based on internal logic speed; the maximum usable speed may be lower due to EDMA limitations and AC timing requirements.

(4)

P = AYNC3 period in ns. For example, when the ASYNC clock domain is running at 100 MHz, use 10 ns.

(5)

Use whichever value is greater.

(6)

C = H or L

S = sample rate generator input clock = P if CLKSM = 1 (P = ASYNC period)

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).

(7)

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

(8)

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

Peripheral Information and Electrical Specifications

143

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