Network Router User Manual

CLKG +
CLKSRG
(1 ) CLKGDV)
(2) 2P = 1/CLKG in ns. CLKG is the output of sample rate generator mux.
SM320F2812-HT
SGUS062A–JUNE 2009 –REVISED APRIL 2010 www.ti.com
6.30 Multichannel Buffered Serial Port (McBSP) Timing
6.30.1 McBSP Transmit and Receive Timing
Table 6-52. McBSP Timing Requirements
(1) (2) (3)
NO. MIN MAX UNIT
1 kHz
McBSP module clock (CLKG, CLKX, CLKR) range
20
(4)
MHz
50 ns
McBSP module cycle time (CLKG, CLKX, CLKR) range
1 ms
M11 t
c(CKRX)
Cycle time, CLKR/X CLKR/X ext 2P ns
M12 t
w(CKRX)
Pulse duration, CLKR/X high or CLKR/X low CLKR/X ext P–7 ns
M13 t
r(CKRX)
Rise time, CLKR/X CLKR/X ext 7 ns
M14 t
f(CKRX)
Fall time, CLKR/X CLKR/X ext 7 ns
CLKR int 18
M15 t
su(FRH-CKRL)
Setup time, external FSR high before CLKR low ns
CLKR ext 2
CLKR int 0
M16 t
h(CKRL-FRH)
Hold time, external FSR high after CLKR low ns
CLKR ext 6
CLKR int 18
M17 t
su(DRV-CKRL)
Setup time, DR valid before CLKR low ns
CLKR ext 2
CLKR int 0
M18 t
h(CKRL-DRV)
Hold time, DR valid after CLKR low ns
CLKR ext 6
CLKX int 18
M19 t
su(FXH-CKXL)
Setup time, external FSX high before CLKX low ns
CLKX ext 2
CLKX int 0
M20 t
h(CKXL-FXH)
Hold time, external FSX high after CLKX low ns
CLKX ext 6
(1) Polarity bits 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.Polarity bits 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.
CLKSRG can be LSPCLK, CLKX, CLKR as source. CLKSRG ≤ (SYSCLKOUT/2). McBSP performance is limited by I/O buffer switching
speed.
(3) Not production tested.
(4) Internal clock prescalers must be adjusted such that the McBSP clock (CLKG, CLKX, CLKR) speeds are not greater than the I/O buffer
speed limit (20 MHz).
142 Electrical Specifications Copyright © 2009–2010, Texas Instruments Incorporated
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