參數(shù)資料
型號(hào): TMS320LC545
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號(hào)處理
英文描述: Digital Signal Processors(20/25ns指令周期, 高性能,大并行度,特殊指令集可有效實(shí)現(xiàn)多種復(fù)雜算法及應(yīng)用的DSP)
中文描述: 數(shù)字信號(hào)處理器(20/25ns指令周期,高性能,大并行度,特殊指令集可有效實(shí)現(xiàn)多種復(fù)雜算法及應(yīng)用的數(shù)字信號(hào)處理器)
文件頁(yè)數(shù): 90/107頁(yè)
文件大小: 2149K
代理商: TMS320LC545
TMS320C54x, TMS320LC54x
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SPRS039A – FEBRUARY 1996 – REVISED JULY 1997
87
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
buffered serial port transmit timing of external frames
switching characteristics over recommended operating conditions (see Figure 34)
PARAMETER
’C54x-40
’LC54x-40
’LC54x-50
’54x-66
UNIT
MIN
MAX
MIN
MAX
td(BDX)
tdis(BDX)
tdis(BDX)pcm
ten(BDX)pcm
th(BDX)
Values derived from characterization data but not tested
Delay time, BDX valid after BCLKX rising
Disable time, BDX after BCLKX rising
Disable time, PCM mode, BDX after BCLKX rising
Enable time, PCM mode, BDX after BCLKX rising
18
18
ns
4
6
4
6
ns
6
6
ns
8
8
ns
Hold Time, BDX valid after BCLKX rising
4
4
ns
timing requirements over recommended operating conditions (see Figure 34)
’C54x-40
’LC54x-40
’LC54x-50
’54x-66
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
tc(SCK)
tf(SCK)
tr(SCK)
Cycle time, serial port clock
Fall time, serial port clock§
Rise time, serial port clock§
25
20
20
ns
4
4
4
ns
4
4
4
ns
tw(SCK)
Pulse duration, serial port clock low/
high§
8.5
6
6
ns
th(BFSX)
Hold time, BFSX after CLKX falling edge
(see Notes 3 and 4)
6
tc(SCK)–6
6
tc(SCK)–6
6
tc(SCK)–6
ns
tsu(BFSX)
Setup time, FSX before CLKX falling
edge (see Notes 3 and 4)
The serial port design is fully static and therefore can operate with tc(SCK) approaching infinity. It is characterized approaching an input frequency
of 0 Hz but tested at a much higher frequency to minimize test time.
§Values assured by design but not tested
If BFSX does not meet this specification, the first bit of the serial data is driven on BDX until BFSX goes low (sampled on falling edge of BCLKX).
After falling edge of the BFSX, data will be shifted out on the BDX pin.
NOTES:
3. Internal clock with external BFSX and vice versa are also allowable. However, BFSX timings to BCLKX always are defined
depending on the source of BFSX, and BCLKX timings always are dependent upon the source of BCLKX. Specifically, the
relationship of BFSX to BCLKX is independent of the source of BCLKX.
4. Timings for BCLKX and BFSX are given with polarity bits (BCLKP and BFSP) set to 0.
6
6
6
ns
A
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