参数资料
型号: DSP56303VL100B1
厂商: Freescale Semiconductor
文件页数: 53/108页
文件大小: 0K
描述: IC DSP 24BIT 100MHZ 196-BGA
标准包装: 630
系列: DSP563xx
类型: 定点
接口: 主机接口,SSI,SCI
时钟速率: 100MHz
非易失内存: ROM(576 B)
芯片上RAM: 24kB
电压 - 输入/输出: 3.30V
电压 - 核心: 3.30V
工作温度: -40°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 196-LBGA
供应商设备封装: 196-MAPBGA(15x15)
包装: 托盘
AC Electrical Characteristics
DSP56303 Technical Data, Rev. 11
Freescale Semiconductor
2-29
2.5.5.5 Asynchronous Bus Arbitration Timings
The asynchronous bus arbitration is enabled by internal synchronization circuits on BG and BB inputs. These
synchronization circuits add delay from the external signal until it is exposed to internal logic. As a result of this
delay, a DSP56300 part may assume mastership and assert BB, for some time after BG is deasserted. This is the
reason for timing 250.
Once BB is asserted, there is a synchronization delay from BB assertion to the time this assertion is exposed to other
DSP56300 components that are potential masters on the same bus. If BG input is asserted before that time, and BG
is asserted and BB is deasserted, another DSP56300 component may assume mastership at the same time.
Therefore, some non-overlap period between one BG input active to another BG input active is required. Timing 251
ensures that overlaps are avoided.
Table 2-15.
Asynchronous Bus Timings1, 2
No.
Characteristics
Expression3
100 MHz4
Unit
Min
Max
250
BB assertion window from BG input deassertion5
2.5
× Tc + 5
30
ns
251
Delay from BB assertion to BG assertion
5
2
× Tc + 5
25
ns
Notes:
1.
Bit 13 in the Operating Mode Register must be set to enter Asynchronous Arbitration mode.
2.
If Asynchronous Arbitration mode is active, none of the timings in Table 2-14 is required.
3.
An expression is used to compute the maximum or minimum value listed, as appropriate.
4.
Asynchronous Arbitration mode is recommended for operation at 100 MHz.
5.
In order to guarantee timings 250, and 251, BG inputs must be asserted to different DSP56300 devices on the same bus in the
non-overlap manner shown in Figure 2-26.
Figure 2-26.
Asynchronous Bus Arbitration Timing
BG1
BB
251
BG2
250
250+251
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