參數(shù)資料
型號(hào): ADSP-21990BBC
廠商: ANALOG DEVICES INC
元件分類: 數(shù)字信號(hào)處理
英文描述: 16-bit fixed point DSP with Flash
中文描述: 16-BIT, 150 MHz, OTHER DSP, PBGA196
封裝: MINI, BGA-196
文件頁數(shù): 27/44頁
文件大小: 574K
代理商: ADSP-21990BBC
–27–
REV. 0
ADSP-21990
External Port Bus Request/Grant Cycle Timing
Table 10
and
Figure 11
describe external port bus request and
bus grant operations.
Table 10. External Port Bus Request and Grant Cycle Timing
Parameter
1, 2
Timing Requirements
t
BS
t
BH
Min
Max
Unit
BR
Asserted to CLKOUT High Setup
CLKOUT High to
BR
Deasserted Hold Time
4.6
0
ns
ns
Switching Characteristics
t
SD
t
SE
t
DBG
t
EBG
t
DBH
t
EBH
CLKOUT High to
xMS
, Address, and
RD
/
WR
Disable
CLKOUT Low to
xMS
, Address, and
RD
/
WR
Enable
CLKOUT High to
BG
Asserted Setup
CLKOUT High to
BG
Deasserted Hold Time
CLKOUT High to
BGH
Asserted Setup
CLKOUT High to
BGH
Deasserted Hold Time
0.5t
HCLK
+1
4
4
4
4
4
ns
ns
ns
ns
ns
ns
0
0
0
0
0
1
t
HCLK
is the peripheral clock period.
2
These are timing parameters that are based on worst-case operating conditions.
Figure 11. External Port Bus Request and Grant Cycle Timing
t
BH
A21–0
CLKOUT
t
BS
t
SD
t
SD
t
SD
t
DBG
t
DBH
t
SE
t
SE
t
SE
t
EBG
t
EBH
BGH
WR
RD
MS3–0
IOMS
BMS
BR
BG
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