参数资料
型号: TMR320R2812PGFA
厂商: Texas Instruments, Inc.
元件分类: 数字信号处理
英文描述: TMS320R2811, TMS320R2812 Digital Signal Processors
中文描述: TMS320R2811,TMS320R2812数字信号处理器
文件页数: 120/147页
文件大小: 2021K
代理商: TMR320R2812PGFA
Electrical Specifications
120
June 2004
SPRS257
Lead
Active
Trail
DIN
t
d(XCOH-XZCSL)
t
d(XCOH-XA)
t
d(XCOHL-XRDL)
t
d(XCOHL-XZCSH)
t
d(XCOHL-XRDH)
WS (Asynch)
XCLKOUT=XTIMCLK
XCLKOUT=1/2 XTIMCLK
XZCS0AND1, XZCS2,
XZCS6AND7
XA[0:18]
XRD
XWE
XR/W
XD[0:15]
XREADY(Asynch)
NOTES: A. All XINTF accesses (lead period) begin on the rising edge of XCLKOUT. When necessary, the device will insert an alignment
cycle before an access to meet this requirement.
B. During alignment cycles, all signals will transition to their inactive state.
C. During inactive cycles, the XINTF address bus will always hold the last address put out on the bus. This includes alignment
cycles.
D. For each sample, setup time from the beginning of the access can be calculated as:
D = (XRDLEAD + XRDACTIVE
3 +n) t
c(XTIM)
t
su(XRDYasynchL)XCOHL
where n is the sample number: n = 1, 2, 3, and so forth.
E. Reference for the first sample is with respect to this point:
E = (XRDLEAD + XRDACTIVE
2) t
c(XTIM)
t
su(XRDYasynchL)XCOHL
t
e(XRDYasynchH)
t
su(XD)XRD
t
a(XRD)
t
a(A)
t
h(XRDYasynchL)
t
h(XD)XRD
t
h(XRDYasynchH)XZCSH
= Don’t care. Signal can be high or low during this time.
Legend:
See Notes
A and B
See Note C
t
su(XRDYasynchH)XCOHL
See Note D
See Note E
Figure 6
29. Example Read With Asynchronous XREADY Access
XTIMING register parameters used for this example:
XRDLEAD
XRDACTIVE
XRDTRAIL
USEREADY
X2TIMING
XWRLEAD
XWRACTIVE
XWRTRAIL
READYMODE
1
3
1
1
0
N/A
N/A
N/A
1 = XREADY
(Asynch)
N/A = “Don’t care” for this example
A
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