MOD5234-100IR NetBurner Inc, MOD5234-100IR Datasheet - Page 329

• Manufacturer Part Number: MOD5234-100IR
• Description: MOD5234 10/100 ETHERNET MODULE
• Manufacturer: NetBurner Inc
• Type: Controllers & Processorsr

Specifications of MOD5234-100IR

• Interface: I²C, SPI, UART
• Voltage - Supply: 2.5V
• Mounting Type: Surface Mount
• Package / Case: Module
• Product: Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Format: -
• Baud Rates: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q4483564

17.5.3 Read Cycle
During a read cycle, the MCF5235 receives data from memory or from a peripheral device.
Figure 17-5
The read cycle timing diagram is shown in
Freescale Semiconductor
S5
State
S5
Read
Write
is a read cycle flowchart.
1.
2.
3.
4.
5.
1.
1.
Cycle
An external device has at most two CLKOUT cycles after the start of
S4 to tristate the data bus. This applies to basic read cycles, fast
termination cycles, and the last transfer of a burst.
In the following timing diagrams, TA waveforms apply for chip
selects programmed to enable either internal or external termination.
TA assertion should look the same in either case.
Set R/W to read
Place address on A[31:0]
Assert TIP, and TSIZ[1:0]
Assert TS
Negate TS
Sample TA low and latch data
Start next cycle
MCF5235
Low
CLKOUT
Table 17-4. Bus Cycle States (Continued)
Figure 17-5. Read Cycle Flowchart
CSn, BSn, and OE are negated on the CLKOUT falling edge of S5. The MCF5235
stops driving address lines and R/W on the rising edge of CLKOUT, terminating the
read or write cycle. At the same time, the MCF5235 negates TIP, and TSIZ[1:0] on
the rising edge of CLKOUT.
Note that the rising edge of CLKOUT may be the start of S0 for the next access
cycle.
The external device stops driving data between S4 and S5.
The data bus returns to high impedance on the rising edge of CLKOUT. The rising
edge of CLKOUT may be the start of S0 for the next access.
MCF5235 Reference Manual, Rev. 2
Figure
NOTE
NOTE
17-6.
Description
1.
2.
3.
1.
2.
Decode address and select the
appropriate slave device.
Drive data on D[31:0]
Assert TA
Negate TA.
Stop driving D[31:0]
System
Data Transfer Operation
17-7