NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 722

• Manufacturer Part Number: NHE6300ESB S L7XJ
• Manufacturer: Intel

Specifications of NHE6300ESB S L7XJ

• Lead Free Status / RoHS Status: Compliant

Table 648. Modem Status Register (MSR) (Sheet 2 of 2)
19.5.1.3.10Scratchpad Register (SCR)
Table 649. Scratch Pad Register (SCR)
19.5.1.3.11Programmable Baud Rate Generator
Table 650. Divisor Latch Register Low (DLL)
Intel
DS
722
®
6300ESB I/O Controller Hub
This 8-bit read/write register has no effect on the UART. It is intended as a scratchpad
register for use by the programmer.
The UART contains a programmable Baud Rate Generator that is capable of taking the
UART_CLK input and dividing it by any divisor from 1 to (2
of the Baud Rate Generator is 16 times the baud rate. Two 8-bit latches store the
divisor in a 16-bit binary format. These Divisor Latches must be loaded during
initialization to ensure proper operation of the Baud Rate Generator. If both Divisor
Latches are loaded with 0, the 16X output clock is stopped. Upon loading either of the
Divisor latches, a 16-bit baud counter is immediately loaded. This prevents long counts
on initial load. Access to the Divisor latch may be done with a word write.
The baud rate of the data shifted in/out of the UART is given by:
For example, if UART_CLK is 14.7456MHz and the divisor is 96, the baud rate is 9600.
A Divisor value of 0 in the Divisor Latch Register is not allowed. The reset value of the
divisor
is 02.
Scratch Pad Register
SCR
read/write
Divisor Latch Register Low
DLL
read/write
Bit Number
Bit Number Bit Mnemonic
7:0
7:0
2
1
0
Bit Mnemonic
BaudRate = UART_CLK(MHz)/[16X Divisor]
BR[7:0]
SP[7:0]
DDSR
DCTS
TERI
Trailing Edge Ring Indicator:
0 = RI# pin has not changed from ’0’ to ’1’ since last read of
MSR.
1 = RI# pin has changed from ’0’ to 1.
Delta Data Set Ready:
0 = No change in DSR# pin since last read of MSR.
1 = DSR# pin has changed state.
Delta Clear To Send:
0 = No change in CTS# pin since last read of MSR.
1 = CTS# pin has changed state.
Address:
Reset State:
Access:
No effect on UART functionality
Address:
Reset State:
Access:
Low byte compare value to generate baud rate
Function
Function
16
Base (DLAB=1)
02H
8-bit
Base + 07H
00H
8-bit
-1). The output frequency
Order Number: 300641-004US
Intel
®
6300ESB ICH—19
November 2007