NHE6300ESB S L7XJ Intel, NHE6300ESB S L7XJ Datasheet - Page 357

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

Specifications of NHE6300ESB S L7XJ

• Lead Free Status / RoHS Status: Compliant

8—Intel
8.3.1.1
Table 233. RDBK_CMD—Read Back Command
8.3.1.2
November 2007
Order Number: 300641-004US
Bits
7:6
5
4
3
2
1
0
®
Note: The Read Back Command is used to determine the count value, programmed mode,
Note: The Counter Latch Command latches the current count value. This command is used to
Device:
Latch Status of Selected
Latch Count of Selected
6300ESB ICH
Read Back Command
Counter 2 Select.
Counter 1 Select.
Counter 0 Select.
RDBK_CMD—Read Back Command
and current states of the OUT pin and Null count flag of the selected counter or
counters. Status and/or count may be latched in any or all of the counters by selecting
the counter during the register write. The count and status remain latched until read,
and further latch commands are ignored until the count is read. Both count and status
of the selected counters may be latched simultaneously by setting both bit 5 and bit 4
to zero. When both are latched, the first read operation from that counter returns the
latched status. The next one or two reads, depending on whether the counter is
programmed for one or two byte counts, returns the latched count. Subsequent reads
return an unlatched count.
Counters.
Counters.
LTCH_CMD—Counter Latch Command
insure that the count read from the counter is accurate. The count value is then read
from each counter's count register through the Counter Ports Access Ports Register
(40h for counter 0, 41h for counter 1, and 42h for counter 2). The count must be read
according to the programmed format, i.e., when the counter is programmed for two
byte counts, two bytes must be read. The two bytes do not have to be read one right
after the other (read, write, or programming operations for other counters may be
inserted between the reads). When a counter is latched once and then latched again
before the count is read, the second Counter Latch Command is ignored.
Reserved
31
Name
Must be “11” to select the Read Back Command
0 = Current count value of the selected counters will be
1 = Current count will not be latched
0 = Status of the selected counters will be latched
1 = Status will not be latched
1 = Counter 2 count and/or status will be latched
1 = Counter 1 count and/or status will be latched
1 = Counter 0 count and/or status will be latched.
Reserved. Must be 0.
latched
Description
Attribute:
Function:
Size:
0
Read-Only
8-bit
Intel
®
6300ESB I/O Controller Hub
Access
357
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