參數(shù)資料
型號: MCIMX537CVV8C
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 800 MHz, RISC PROCESSOR, PBGA529
封裝: 19 X 19 MM, 0.80 MM PITCH, ROHS COMPLIANT, PLASTIC, TEPBGA-529
文件頁數(shù): 11/172頁
文件大?。?/td> 4562K
代理商: MCIMX537CVV8C
i.MX53 Applications Processors for Industrial Products, Rev. 3
108
Freescale Semiconductor
Electrical Characteristics
4.7.12
PATA Timing Parameters
This section describes the timing parameters of the Parallel ATA module which are compliant with
ATA/ATAPI-6 specification.
Parallel ATA module can work on PIO/Multi-Word DMA/Ultra DMA transfer modes. Each transfer mode
has different data transfer rate, Ultra DMA mode 4 data transfer rate is up to 100MB/s. Parallel ATA
module interface consist of a total of 29 pins. Some pins act on different function in different transfer
mode. There are different requirements of timing relationships among the function pins conform with
ATA/ATAPI-6 specification and these requirements are configurable by the ATA module registers.
Table 69 and Figure 63 define the AC characteristics of all the PATA interface signals in all data transfer
modes.
Figure 63. PATA Interface Signals Timing Diagram
The user must use level shifters for 5.0 V compatibility on the ATA interface. The i.MX53 PATA interface
is 3.3 V compatible.
The use of bus buffers introduces delay on the bus and skew between signal lines. These factors make it
difficult to operate the bus at the highest speed (UDMA-5) when bus buffers are used. If fast UDMA mode
operation is needed, this may not be compatible with bus buffers.
Another area of attention is the slew rate limit imposed by the ATA specification on the ATA bus.
According to this limit, any signal driven on the bus should have a slew rate between 0.4 and 1.2 V/ns with
a 40 pF load. Not many vendors of bus buffers specify slew rate of the outgoing signals.
When bus buffers are used, the ata_data bus buffer is special. This is a bidirectional bus buffer, so a
direction control signal is needed. This direction control signal is ata_buffer_en. When its high, the bus
should drive from host to device. When its low, the bus should drive from device to host. Steering of the
signal is such that contention on the host and device tri-state busses is always avoided.
Table 69. AC Characteristics of All Interface Signals
ID
Parameter
Symbol
Min
Max
Unit
SI1
Rising edge slew rate for any signal on ATA interface1
1 SRISE and SFALL shall meet this requirement when measured at the sender’s connector from 10–90% of full signal
amplitude with all capacitive loads from 15
40 pF where all signals have the same capacitive load value.
Srise
—1.25
V/ns
SI2
Falling edge slew rate for any signal on ATA interface1
Sfall
—1.25
V/ns
SI3
Host interface signal capacitance at the host connector
Chost
—20
pF
ATA Interface Signals
SI1
SI2
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