參數(shù)資料
型號： CDK8920A
廠商： Cirrus Logic, Inc.
英文描述： CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER
中文描述： 水晶藍(lán)的ISA即插即用，即插即用以太網(wǎng)控制器
文件頁數(shù)： 120/144頁
文件大?。?/td> 1229K
代理商： CDK8920A
6.0
TEST MODES
Loopback & Collision Diagnostic Tests
Internal and external Loopback and Collision
tests can be used to verify the CS8920A’s func-
tionality when configured for either 10BASE-T
or AUI operation.
Internal Tests
Internal tests allow the major digital functions to
be tested, independent of the analog functions.
During these tests, the Manchester encoder is
connected to the decoder. All digital circuits are
operational, and the transmitter and receiver are
disabled.
External Tests
External test modes allow the complete chip to
be tested without connecting it directly to an
Ethernet network.
Loopback Tests
During Loopback tests, the internal Carrier Sense
(CRS) signal, used to detect collisions, is ig-
nored, allowing packet reception during packet
transmission.
10BASE-T Loopback and Collision Tests
10BASE-T Loopback and Collision Tests are
controlled by two bits: Force FDX (Register 1D,
AutoNegCTL, Bit F) and ENDECloop (Register
19, TestCTL, Bit 9). Table 6.1 describes these
tests.
AUI Loopback and Collision Tests
AUI Loopback and Collision tests are controlled
by two bits in the Test Control register: AUIloop
(Register 19, TestCTL, Bit A) and ENDECloop
(Register 19, TestCTL, Bit 9). Table 6.2 de-
scribes these tests.
Test Mode
10BASE-T Internal
Loopback
10BASE-T
Internal
Collision
FDX
1
ENDECloop
1
Description of Test
Transmit a frame and verify that the frame is received without error.
0
1
Transmit frames and verify that collisions are detected and that
internal counters function properly. After 16 collisions, verify that
16coll (Register 8, TxEvent, Bit F) is set.
Connect TXD+ to RXD+ and TXD- to RXD-. Transmit a frame and
verify that the frame is received without error.
Connect TXD+ to RXD+ and TXD- to RXD-. Transmit frames and
verify that collisions are detected and that internal counters function
properly. After 16 collisions, verify that 16coll (Register 8, TxEvent,
Bit F) is set.
10BASE-T
External Loopback
10BASE-T
External
Collision
1
0
0
0
Table 6.1. 10BASE-T Loopback and Collision Tests
CS8920A
120
DS238PP2
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