參數(shù)資料
型號(hào): ADSP-2191
廠商: Analog Devices, Inc.
元件分類: 數(shù)字信號(hào)處理
英文描述: DSP Microcomputer
中文描述: DSP微機(jī)
文件頁數(shù): 23/52頁
文件大小: 1873K
代理商: ADSP-2191
–23–
REV. 0
ADSP-2191M
External Port Write Cycle Timing
Table 12
and
Figure 11
describe external port write operations.
The external port lets systems extend read/write accesses in three ways: waitstates, ACK input, and combined waitstates and ACK.
To add waits with ACK, the DSP must see ACK low at the rising edge of EMI clock. ACK low causes the DSP to wait, and the DSP
requires two EMI clock cycles after ACK goes high to finish the access. For more information, see the External Port chapter in the
ADSP-219x/2191 DSP Hardware Reference
.
Table 12. External Port Write Cycle Timing
Parameter
1, 2
1
t
HCLK
is the peripheral clock period.
2
These are timing parameters that are based on worst-case operating conditions.
3
W = (number of waitstates specified in wait register) t
HCLK.
4
Write hold cycle–memory select control registers (MS
CTL).
Min
Max
Unit
Switching Characteristics
t
CSWS
t
AWS
t
WSCS
t
WSA
t
WW
t
CDA
t
CDD
t
DSW
t
DHW
t
DHW
t
WWR
Chip Select Asserted to
WR
Asserted Delay
Address Valid to
WR
Setup and Delay
WR
Deasserted to Chip Select Deasserted
WR
Deasserted to Address Invalid
WR
Strobe Pulsewidth
WR
to Data Enable Access Delay
WR
to Data Disable Access Delay
Data Valid to
WR
Deasserted Setup
WR
Deasserted to Data Invalid Hold Time; E_WHC
4
WR
Deasserted to Data Invalid Hold Time; E_WHC
4
WR
Deasserted to
WR
,
RD
Asserted
0.5t
HCLK
–4
0.5t
HCLK
–3
0.5t
HCLK
–4
0.5t
HCLK
–3
t
HCLK
–2+W
3
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0
0.5t
HCLK
+4
t
HCLK
+7+W
3
0.5t
HCLK
–3
t
HCLK
+1+W
3
3.4
t
HCLK
+3.4
t
HCLK
Timing Requirements
t
AKW
t
DWSAK
ACK Strobe Pulsewidth
ACK Delay from
WR
Low
12.5
0
ns
ns
Figure 11. External Port Write Cycle Timing
D 1 5 – 0
t
A W S
t
W W
t
A K W
t
D S W
t
D H W
t
C D D
A C K
W R
A 2 1 – 0
MS3–0
IOMS
BMS
t
C S W S
t
W S A
t
W S C S
t
C D A
t
D W S A K
t
W W R
RD
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