s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 316
s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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HDLC CONTROLLERS
8-30
Number
[10]
[11]
Bit
[7]
[8]
[9]
DMA Rx enable
(DRxEN)
DPLL enable (DPLLEN) Setting this bit enables the DPLL, causing the DPLL to enter search mode.
BRG enable (BRGEN)
Tx 4 word mode
(Tx4WD)
Rx 4 word mode
(Rx4WD)
Bit Name
Table 8-9. HCON Register Description (Continued)
The DRxEN bit lets the HDLC Rx operate on a bus system in DMA mode.
When DMA Rx is enabled, an interrupt request caused by the RxFA status
is inhibited, and the HDLC does not use the interrupt request to request a
data transfer. DMA Rx monitors the HRXFIFO and moves the data from
the HRXFIFO to memory. This bit is automatically disabled when the next
buffer descriptor pointer becomes null, or the owner bit is not in DMA mode
when the DTxSTSK bit is set.
In Search mode, the DPLL searches for a locking edge in the incoming
data stream.
After DPLL is enabled (in NRZI mode for example), the DPLL starts
sampling immediately after the first edge is detected. (In FM mode, the
DPLL examines the clock edge of every other bit to decide what correction
must be made to remain in sync.) If the DPLL does not detect an edge
during the expected window, it sets the one clock missing bit.
If the DPLL does not detect an edge after two successive attempts, it sets
the two clock missing bit and the DPLL automatically enters the Search
mode. To reset both clocks missing latches, you can disable and re-enable
the DPLL using the reset Rx status.
This bit controls the operation of the baud rate generator (BRG). To enable
the BRG counter, set the BRGEN bit to '1'. To inhibit counting, clear the bit
to '0'.
When this bit is '0', and TxFA bit in status register is '1', it is indicated that
Tx FIFO is empty for 1 word. It means that 1-word data can be loaded to
Tx FIFO.
Similarly, when this bit is '1', the same status register bit indicate that 4
words of data can be loaded to Tx FIFO without reading the status bit for a
second time.
Specifically, the status register bit affected by the 1-word or 4-word transfer
setting are the transmit data available (TxFA) bit.
When this bit is '0', and the RxFA bit in the status register is '1', it is
indicated that Rx FIFO has 1-word data. It means that 1 word data can be
moved to memory.
Similarly, when this bit is '1', the same status register bit indicates that 4
words of data can be moved in the memory without reading the status bit
for a second time.
Specifically, the status register bit affected by the 1-word or 4-word transfer
setting are the receive data available (RxFA) bit, and the residue bytes
status bits, RxRB[3:0].
Description
S3C4510B
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