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CS89712 데이터시트(PDF) 74 Page - Cirrus Logic

부품명 CS89712
상세설명  HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH 10BASE-T ETHERNET CONTROLLER
PDF  170 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS89712
74
DS502PP2
3.2.5
Status and Event Registers
Status and Event registers report the status of trans-
mitted and received frames, as well as information
about the configuration of the CS89712. They are
read-only.
The Interrupt Status Queue (ISQ) is a special type
of Status/Event register. It is located at Ethernet
Port offset address 0120h and is the first register
the software reads when responding to an Interrupt.
A more detailed description of the ISQ can be
found in Section 2.31, “Managing Interrupts &
Status Queue”.
Three 10-bit counters are included with the Status
and Event registers. RxMISS counts missed re-
ceive frames, TxCOL counts transmit collisions.
Table 34 summarizes Ethernet Port Register types.
3.2.6
Status and Control Bit Definitions
This section provides a description of the special
bit types used in the Status and Control registers.
1
0
32
54
76
10 Register Bits
1 = Control/Configuration
0 = Status/Event
Internal Address
(bits 0 - 5)
16-bit Register Word
Bit Number
98
BA
DC
F E
Figure 23. Status and Control Register Format
Suffix
Type
Description
Comments
CMD
Read/Write
Command: Written once per frame to initiate transmit.
CFG
Read/Write
Configuration: Written at setup and used to determine
what frames will be transmitted and received and what
events will cause interrupts.
CTL
Read/Write
Control: Written at setup and used to determine what
frames will be transmitted and received and how the physi-
cal interface will be configured.
Event
Read-only
Event: Reports the status of transmitted and received
frames.
cleared when read
ST
Read-only
Status: Reports information about the configuration of the
CS89712.
Read-only
Counters: Counts missed receive frames and collisions.
Provides time domain for locating coax cable faults.
cleared when read
Table 34. Ethernet Port Register Types



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