Table 4-8 Host Interface Port Tim" />
參數(shù)資料
型號: DSP56857BUE
廠商: Freescale Semiconductor
文件頁數(shù): 25/53頁
文件大小: 0K
描述: IC DSP 16BIT 120MHZ 100-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: 568xx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 120MHz
連通性: SCI,SPI,SSI
外圍設(shè)備: DMA,POR,WDT
輸入/輸出數(shù): 47
程序存儲器容量: 80KB(40K x 16)
程序存儲器類型: SRAM
RAM 容量: 24K x 16
電壓 - 電源 (Vcc/Vdd): 1.62 V ~ 1.98 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-LQFP
包裝: 托盤
Host Interface Port
56857 Technical Data, Rev. 6
Freescale Semiconductor
31
4.7 Host Interface Port
Table 4-8 Host Interface Port Timing1
Operating Conditions: VSS = VSSIO = VSSA = 0 V, VDD = 1.62-1.98V, VDDIO = VDDA = 3.0–3.6V, TA = –40° to +120°C, CL ≤ 50pF, fop = 120MHz
1. The formulas: T = clock cycle. f ipb = 60MHz, T = 16.7ns.
Characteristic
Symbol
Min
Max
Unit
See Figure
Access time
TACKDV
—13
ns
Disable time
TACKDZ
3—
ns
Time to disassert
TACKREQH
3.5
9
ns
Lead time
TREQACKL
0—
ns
Access time
TRADV
—13
ns
Disable time
TRADX
5—
ns
Disable time
TRADZ
3—
ns
Setup time
TDACKS
3—
ns
Hold time
TACKDH
1—
ns
Setup time
TADSS
3—
ns
Hold time
TDSAH
1—
ns
Pulse width
TWDS
5—
ns
Time to re-assert
1. After second write in 16-bit mode
2. After first write in 16-bit mode
or after write in 8-bit mode
TACKREQL
4T + 5
5
5T + 9
13
ns
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