PEB20534H-10 SIEMENS [Siemens Semiconductor Group], PEB20534H-10 Datasheet - Page 416
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PEB20534H-10
Manufacturer Part Number
PEB20534H-10
Description
DMA Supported Serial Communication Controller with 4 Channels DSCC4
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.PEB20534H-10.pdf
(442 pages)
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A data phase may consist of a data transfer and wait cycles. A data phase completes
when data is transferred, which occurs when both IRDY and TRDY are asserted. When
either is deasserted a wait cycle is inserted. In the example below, data is successfully
transferred on clocks 4, 6 and 8, and wait cycles are inserted on clocks 3, 5 and 7. The
first data phase completes in the minimum time for a read transaction. The second data
phase is extended on clock 5 because TRDY is deasserted. The last data phase is
extended because IRDY is deasserted on clock 7.
The Master knows at clock 7 that the next data phase is the last. However, the master is
not ready to complete the last transfer, so IRDY is deasserted on clock 7, and FRAME
stays asserted. Only when IRDY is asserted can FRAME be deasserted, which occurs
on clock 8.
Figure 88
CLK
FRAME
AD
C/BE
IRDY
TRDY
DEVSEL
1
PCI Read Transaction
Bus CMD
Address
Address
Phase
2
3
Phase
Data
Data 1
4
Bus Transaction
416
5
BE’s
Phase
Data
Data 2
6
Electrical Characteristics
7
Data 3
Phase
Data
Data Sheet 09.98
8
PEB 20534
ITD07575
9
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