參數(shù)資料
型號： SPC5121YVY400BR
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, ROHS COMPLIANT, PLASTIC, TFBGA-516
文件頁數(shù)： 40/86頁
文件大?。?/td> 719K
代理商： SPC5121YVY400BR
Electrical and Thermal Characteristics
MPC5121E/MPC5123 Data Sheet, Rev. 3
Freescale Semiconductor
45
Faster ATA modes (i.e., UDMA 0, 1, 2) are supported when the system is running at a sufficient frequency to provide adequate
data transfer rates. Adequate data transfer rates are a function of the following:
The MPC5121e/MPC5123 operating frequency (IP bus clock frequency)
Internal MPC5121e/MPC5123 bus latencies
Other system load dependent variables
The ATA clock is the same frequency as the IP bus clock in MPC5121e/MPC5123. See the MPC5121e/MPC5123 Reference
Manual.
NOTE
All output timing numbers are specified for nominal 50 pF loads.
3.3.9.1
PATA Timing Parameters
In the timing equations, some timing parameters are used. These parameters depend on the implementation of the ATA interface
in silicon, the bus transceiver used, the cable delay and cable skew. The parameters shown in Table 3-25 specify the ATA timing.
Table 3-25. PATA Timing Parameters
Name
Meaning
Controlled by
Value
SpecID
T
PATA Bus clock period
MPC5121E/M
PC5123
15 ns
A9.1
ti_ds
Set-up time ATA_DATA to ATA_IORDY edge (UDMA-in only)
MPC5121E/M
PC5123
2 ns
A9.2
ti_dh
Hold time ATA_IORDY edge to ATA_DATA (UDMA-in only)
MPC5121E/M
PC5123
5 ns
A9.3
tco
Propagation delay bus clock L-to-H to: ATA_CS0, ATA_CS1, ATA_DA2,
ATA_DA1, ATA_DA0, ATA_DIOR, ATA_DIOW, ATA_DMACK, ATA_DATA,
ATA_BUFFER_EN
MPC5121E/M
PC5123
2 ns
A9.4
tsu
Set-up time ATA_DATA to bus clock L-to-H
MPC5121E/M
PC5123
2 ns
A9.5
tsui
Set-up time ATA_IORDY to bus clock H-to-L
MPC5121E/M
PC5123
2 ns
A9.6
thi
Hold time ATA_IORDY to bus clock H to L
MPC5121E/M
PC5123
2 ns
A9.7
tskew1
Max difference in propagation delay bus clock L-to-H to any of following
signals: ATA_CS0, ATA_CS1, ATA_DA2, ATA_DA1, ATA_DA0, ATA_DIOR,
ATA_DIOW, ATA_DMACK, ATA_DATA (WRITE), ATA_BUFFER_EN
MPC5121E/M
PC5123
1.7 ns
A9.8
tskew2
Max difference in buffer propagation delay for any of following signals:
ATA_CS0, ATA_CS1, ATA_DA2, ATA_DA1, ATA_DA0, ATA_DIOR,
ATA_DIOW, ATA_DMACK, ATA_DATA (WRITE), ATA_BUFFER_EN
Transceiver
A9.9
tskew3
Max difference in buffer propagation delay for any of following signals:
ATA_IORDY, ATA_DATA (read)
Transceiver
A9.10
tbuf
Max buffer propagation delay
Transceiver
A9.11
tcable1
Cable propagation delay for ata_data
Cable
A9.12
tcable2
Cable propagation delay for control signals: ATA_DIOR, ATA_DIOW,
ATA_IORDY, ATA_DMACK
Cable
A9.13
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