参数资料
型号: ADSP-21991BBCZ
厂商: Analog Devices Inc
文件页数: 20/44页
文件大小: 0K
描述: IC DSP CTLR 16BIT 196CSPBGA
标准包装: 1
系列: ADSP-21xx
类型: 定点
接口: SPI,SSP
时钟速率: 150MHz
非易失内存: 外部
芯片上RAM: 112kB
电压 - 输入/输出: 3.30V
电压 - 核心: 2.50V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 196-BGA
供应商设备封装: 196-MBGA(15x15)
包装: 托盘
–27–
REV. 0
ADSP-21991
External Port Read Cycle Timing
Table 9 and Figure 10 describe external port read operations.
For additional information on the ACK signal, see the discussion
Table 9. External Port Read Cycle Timing
Parameter
1, 2
Min
Max
Unit
Timing Requirements
tAKW
ACK Strobe Pulsewidth
tHCLK
ns
tRDA
RD Asserted to Data Access Setup
tEMICLK–5+W
3
ns
tADA
Address Valid to Data Access Setup
tEMICLK+W
3
ns
tSDA
Chip Select Asserted to Data Access Setup
tEMICLK+W
3
ns
tSD
Data Valid to
RD Deasserted Setup
5
ns
tHRD
RD Deasserted to Data Invalid Hold
0
ns
tDRSAK
ACK Delay from
XMS Low
0.5tEMICLK–1
ns
Switching Characteristics
tCSRS
Chip Select Asserted to
RD Asserted Delay
0.5tEMICLK–3
ns
tARS
Address Valid to
RD Setup and Delay
0.5tEMICLK–3
ns
tRSCS
RD Deasserted to Chip Select Deasserted Setup
0.5tEMICLK–2
ns
tRW
RD Strobe Pulsewidth
tEMICLK–2+ W
3
ns
tRSA
RD Deasserted to Address Invalid Setup
0.5tHCLK–2
ns
tRWR
RD Deasserted to WR, RD Asserted
tHCLK
ns
1 tEMICLK is the External Memory Interface clock period. tHCLK is the peripheral clock period.
2 These are timing parameters that are based on worst-case operating conditions.
3 W = (number of wait states specified in wait register)
tEMICLK.
Figure 10. External Port Read Cycle Timing
tARS
D15–0
tRW
tAKW
tCDA
tRDA
tADA
tSDA
tSD
tHRD
ACK
RD
A21–0
tCSRS
tRSA
tRSCS
tRWR
MS3--0
IOMS
BMS
WR
tDRSAK
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