CS8900A-IQ Cirrus Logic Inc, CS8900A-IQ Datasheet - Page 107

• Manufacturer Part Number: CS8900A-IQ
• Description: Ethernet ICs IC 10Mbps Ethernet Controller 5V
• Manufacturer: Cirrus Logic Inc

Specifications of CS8900A-IQ

• Ethernet Connection Type: 10Base- 2, 10Base- 5, 10Base- F, 10Base- T
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE 802.3
• Data Rate: 10 Mbps
• Maximum Operating Temperature: + 85 C
• Package / Case: LQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS271F5
6.0 TEST
6.1 TEST MODES
6.1.1 Loopback & Collision Diagnostic
Tests
Internal and external Loopback and Collision
tests can be used to verify the CS8900A's
functionality
10BASE-T or AUI operation.
6.1.2 Internal Tests
Internal tests allow the major digital functions
to be tested, independent of the analog func-
tions. During these tests, the Manchester en-
coder is connected to the decoder. All digital
circuits are operational, and the transmitter
and receiver are disabled.
6.1.3 External Tests
External test modes allow the complete chip to
be tested without connecting it directly to an
Ethernet network.
CS8900A
Crystal LAN™ Ethernet Controller
External Collision
10BASE-T Inter-
10BASE-T Inter-
AUI External
AUI Collision
AUI Internal
External Loop-
Test Mode
nal Loopback
nal Collision
Loopback
Loopback
Test Mode
10BASE-T
10BASE-T
back
when
AUIloop ENDECloop
1
1
0
FDX
1
0
1
0
configured
Table 37. 10BASE-T Loopback and Collision Tests
Table 38. AUI Loopback and Collision Tests
ENDECloop
1
0
0
CIRRUS LOGIC PRODUCT DATASHEET
1
1
0
0
for
Transmit a frame and verify that the frame is received without error.
Connect DO+ to DI+ and DO- to DI-. Transmit a frame and verify that
the frame is received without error (since there is no collision signal,
an SQE error will occur).
Start transmission and observe DO+/DO- activity. Input a 10 MHz
sine wave to Cl+/Cl- pins and observe collisions.
either
Transmit a frame and verify that the frame is received without
error.
Transmit frames and verify that collisions are detected and
that the 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 coun-
ters function properly. After 16 collisions, verify that 16coll
(Register 8, TxEvent, Bit F) is set.
6.1.4 Loopback Tests
During Loopback tests, the internal Carrier
Sense (CRS) signal, used to detect collisions,
is ignored, allowing packet reception during
packet transmission.
6.1.5 10BASE-T Loopback and Collision
Tests
10BASE-T Loopback and Collision Tests are
controlled by two bits in the Test Control regis-
ter: FDX (Register 19, TestCTL, Bit E) and EN-
DECloop (Register 19, TestCTL, Bit 9). Table
37 describes these tests.
6.1.6 AUI Loopback and Collision Tests
AUI Loopback and Collision tests are con-
trolled by two bits in the Test Control register:
AUIloop (Register 19, TestCTL, Bit A) and EN-
DECloop (Register 19, TestCTL, Bit 9). Table
38 describes these tests.
Description of Test
Description of Test
107