參數(shù)資料
型號(hào): SM320F2812HFGM
廠商: TEXAS INSTRUMENTS INC
元件分類: 數(shù)字信號(hào)處理
英文描述: 16-BIT, 150 MHz, OTHER DSP, CQFP172
封裝: NCTB, CERAMIC, QFP-172
文件頁數(shù): 18/147頁
文件大?。?/td> 1721K
代理商: SM320F2812HFGM
Electrical Specifications
114
December 2004
SGUS053
If the XREADY signal is sampled in the Synchronous mode (USEREADY = 1, READYMODE = 0), then:
1.
Lead:
LR
≥ tc(XTIM)
LW
≥ tc(XTIM)
2.
Active:
AR
≥ 2 x tc(XTIM)
AW
≥ 2 x tc(XTIM)
NOTE: Restriction does not include external hardware wait states
These requirements result in the following XTIMING register configuration restrictions:
XRDLEAD
XRDACTIVE
XRDTRAIL
XWRLEAD
XWRACTIVE
XWRTRAIL
X2TIMING
1
0
1
0
0, 1
No hardware to detect illegal XTIMING configurations
Examples of valid and invalid timing when using Synchronous XREADY:
XRDLEAD
XRDACTIVE
XRDTRAIL
XWRLEAD
XWRACTIVE
XWRTRAIL
X2TIMING
Invalid
0
0, 1
Invalid
1
0
1
0
0, 1
Valid
1
0
1
0
0, 1
No hardware to detect illegal XTIMING configurations
If the XREADY signal is sampled in the Asynchronous mode (USEREADY = 1, READYMODE = 1), then:
1.
Lead:
LR
≥ tc(XTIM)
LW
≥ tc(XTIM)
2.
Active:
AR
≥ 2 x tc(XTIM)
AW
≥ 2 x tc(XTIM)
NOTE: Restriction does not include external hardware wait states
3.
Lead + Active:
LR + AR
≥ 4 x tc(XTIM)
LW + AW
≥ 4 x tc(XTIM)
NOTE: Restriction does not include external hardware wait states
These requirements result in the following XTIMING register configuration restrictions:
XRDLEAD
XRDACTIVE
XRDTRAIL
XWRLEAD
XWRACTIVE
XWRTRAIL
X2TIMING
1
2
0
1
2
0
0, 1
No hardware to detect illegal XTIMING configurations
or
XRDLEAD
XRDACTIVE
XRDTRAIL
XWRLEAD
XWRACTIVE
XWRTRAIL
X2TIMING
2
1
0
2
1
0
0, 1
No hardware to detect illegal XTIMING configurations
Examples of valid and invalid timing when using Asynchronous XREADY:
XRDLEAD
XRDACTIVE
XRDTRAIL
XWRLEAD
XWRACTIVE
XWRTRAIL
X2TIMING
Invalid
0
0, 1
Invalid
1
0
1
0
0, 1
Invalid
1
0
1
0
Valid
1
0
1
0
1
Valid
1
2
0
1
2
0
0, 1
Valid
2
1
0
2
1
0
0, 1
No hardware to detect illegal XTIMING configurations
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