参数资料
型号: ADSP-2105BP-80
厂商: Analog Devices Inc
文件页数: 42/64页
文件大小: 0K
描述: IC DSP CONTROLLER 16BIT 68PLCC
标准包装: 19
系列: ADSP-21xx
类型: 定点
接口: 同步串行端口(SSP)
时钟速率: 20MHz
非易失内存: 外部
芯片上RAM: 3kB
电压 - 输入/输出: 5.00V
电压 - 核心: 5.00V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 68-LCC(J 形引线)
供应商设备封装: 68-PLCC(24.23x24.23)
包装: 管件
ADSP-21xx
REV. B
–47–
TIMING PARAMETERS (ADSP-2103/2162/2164)
BUS REQUEST/GRANT
Frequency
10.24 MHz
Dependency
Parameter
Min
Max
Min
Max
Unit
Timing Requirement:
tBH
BR Hold after CLKOUT High1
29.4
0.25tCK + 5
ns
tBS
BR Setup before CLKOUT Low
1
44.4
0.25tCK + 20
ns
Switching Characteristic:
tSD
CLKOUT High to DMS, PMS, BMS, RD, WR Disable
44.4
0.25tCK + 20
ns
tSDB
DMS, PMS, BMS, RD, WR Disable to BG Low
0
ns
tSE
BG High to DMS, PMS, BMS, RD, WR Enable
0
ns
tSEC
DMS, PMS, BMS, RD, WR Enable to CLKOUT High
14.4
0.25tCK – 10
ns
NOTES
1If BR meets the t
BS and tBH setup/hold requirements, it will be recognized in the current processor cycle; otherwise it is recognized in the following cycle. BR
requires a pulse width greater than 10 ns.
Section 10.2.4, “Bus Request/Grant,” of the
ADSP-2100 Family User’s Manual (1st Edition, 1993) states that “When BR is recognized, the processor
responds immediately by asserting BG during the same cycle.” This is incorrect for the current versions of all ADSP-21xx processors: BG is asserted in the
cycle after BR is recognized. No external synchronization circuit is needed when BR is generated as an asynchronous signal.
Figure 41. Bus Request/Grant
CLKOUT
PMS, DMS
BMS, RD
WR
t
BS
BR
BG
CLKOUT
t
SD
t
SDB
t
SE
t
SEC
t
BH
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