AMD Advanced Micro Devices AM79761YC-14, AM79761YC-10 Datasheet
PRELIMINARY
Am79761
Physical Layer 10-Bit Transceiver for Gigabit Ethernet
(GigaPHY™-SD)
DISTINCTIVE CHARACTERISTICS
n
Gigabit Ethernet Transceiver operates at
1.25 Gigabits per second (Gbps)
n
Suitable for both Coaxial and Optical Link
applications
n
10-bit TTL Interface for Transmit and Receive
Data
n
Monolithic Clock Synthesis and Clock Recovery
requires no external components
n
Word Synchronization Function (Comma
Detect)
n
Low Power Operation - 700 mW typical
n
64-pin Standard PQFP
— 14 x 14 mm (0˚ C - 70˚ C)
— 10 x 10 mm (0˚ C - 50˚ C)
n
125 MHz TTL Reference Clock
n
Loopback Diagnostic
n
Single +3.3 V Supply
GENERAL DESCRIPTION
The Am79761 Gigabit Ethernet Physical Layer Serializer/Deserializer (GigaPHY-SD) device is a 1.25 Gbps
Ethernet Transceiver optimized for Gigabit Ethernet/
1000BASE-X applications. It implements the Physical
Medium Attachment (PMA) layer for a single port.
The GigaPHY-SD device can interface to fiber-optic
media to support 1000BASE-LX and 1000BASE-SX
applications and can interface to copper coax to support 1000BASE-CX applications.
The functions performed by the device include serializing the 8B/10B 10-bit data for transmission, deserializing received code groups, recov ering the clock from the
incoming data stream, and word synchronization.
When transmitting, the GigaPHY-SD device receives
10-bit 8B/10B code groups at 125 million code groups
per second. It then serializes the parallel data stream,
adding a reference clock, and transmits it through the
PECL drivers.
When receiving, the GigaPHY-SD device receives the
PECL data stream from the network. It then recovers
the clock from the data stream, deserializes the data
stream into a 10-bit code group, and transmits it to the
Physical Coding Sublayer (PCS) logic above. Optionally, it detects comma characters used to align the incoming word.
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.
Publication# 21560 Rev: A Amendment/+1
Issue Date: April 1998
BLOCK DIAGRAM
PRELIMINARY
TXD[0:9]
REFCLK
EWRAP
RXD[0:9]
RCLK
RCLKN
COM_DET
EN_CDET
10
10
Q D
D Q
Frame
Logic
Parallel
to Serial
PLL Clock
Multiply
Serial to
Parallel
10
20
Comma
Detect
Clock
Recovery
TX+
TX-
RX+
RX-
21560A-1
2 Am79761
CONNECTION DIAGRAM
PRELIMINARY
N/C
DVDD_P
TX+
TX-
DVDD_P
DVDD
AVSS
AVDD
DVSS
DVDD
RX+
DVDD_P
RX-
DVSS
DVDD
N/C
Note:
N/C = No Connect
DVSS
TXD0
TXD1
TXD2
DVDD
TXD3
TXD4
TXD5
TXD6
DVDD
TXD7
TXD8
TXD9
DVSS
DVSS
N/C
646362616059585756555453525150
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
171819202122232425262728293031
N/C
TEST1
DVSS
TEST2
EWRAP
TEST3
REFCLK
EN_CDET
DVSS
TEST4
N/C
DVDD
DVDD_T
32
RCLK
RCLKN
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
DVSS_T
N/C
COM_DET
DVSS_T
RXD0
RXD1
RXD2
DVDD_T
RXD3
RXD4
RXD5
RXD6
DVDD_T
RXD7
RXD8
RXD9
DVSS_T
21560A-2
LOGIC SYMBOL
REFCLK
RCLK
PHY
Control
Test
Port
RCLKN
EN_CDET
EWRAP
COM_DET
TEST4
TDST [3:1]
DVDD DVDD_T DVDD_P AVDD
Am79761
GigaPHY-SD
DVSS DVSS_D DVSS
Am79761 3
TXD [0:9]
RXD [0:9]
TX+
TX–
RX+
RX–
To PCS
Transceiver
21560A-3
PRELIMINARY
ORDERING INFORMATION
Standard Products
AMD standard products are available in se veral pac kages and operating ranges . The order number (V alid Combination) is f ormed
by a combination of the elements below.
Am79761
CY
-10
PACKAGE SIZE OPTION
-10 = 10 x 10 mm body size
-14 = 14 x 14 mm body size
TEMPERATURE RANGE
C = Commercial (0˚C to +70˚C)
P ACKA GE TYPE
Y = 64-Pin Plastic Quad Flat Pack (PDH064)
DEVICE NUMBER/DESCRIPTION
Am79761
Physical Layer 10-Bit Transceiver for Gigabit Ethernet
GigaPHY™-SD)
Valid Combinations
Am79761YC
Am79761YC
-10
-14
Valid Combinations
Valid Combinations list configurations planned to be supported in volume for this device. Consult the local AMD sales
office to confirm availability of specific valid combinations and
to check on newly released combinations.
4 Am79761
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PRELIMINARY
Part No.
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Am79C982 basic Integrated Multiport Repeater (bIMR™)
Am79C983 Integrated Multiport Repeater 2 (IMR2™)
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Am79C985 enhanced Integrated Multiport Repeater Plus (eIMR+™)
Am79C987 Hardware Implemented Management Information Base (HIMIB™)
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Am79C900 Integrated Local Area Communications Controller (ILACC™)
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Am79C960 PCnet™-ISA Single-Chip Ethernet Controller (for ISA bus)
Am79C961 PCnet™-ISA+ Single-Chip Ethernet Controller for ISA (with Microsoft® Plug n’ Play® Support)
Am79C961A PCnet™-ISA II Full Duplex Single-Chip Ethernet Controller for ISA
Am79C965 PCnet™-32 Single-Chip 32-Bit Ethernet Controller
Am79C970 PCnet™-PCI Single-Chip Ethernet Controller (for PCI bus)
Am79C970A PCnet™-PCI II Full Duplex Single-Chip Ethernet Controller (for PCI bus)
Am79C971 PCnet™-
Description
Local Area Network Controller for Ethernet (LANCE)
FAST
Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
Am79761 5
PIN DESIGNATION
Listed by Pin Number
PRELIMINARY
Pin No.
1
2 TXD0 18 TEST1 34 RXD9 50 DVDD
3 TXD1 19 EWRAP 35 RXD8 51 DVSS
4 TXD2 20 TEST2 36 RXD7 52 RX5 DVDD 21 DVSS 37 DVDD_T 53 DVDD_P
6 TXD3 22 REFCLK 38 RXD6 54 RX+
7 TXD4 23 TEST3 39 RXD5 55 DVDD
8 TXD5 24 EN_CDET 40 RXD4 56 DVSS
9 TXD6 25 DVSS 41 RXD3 57 AVDD
10 DVDD 26 TEST4 42 DVDD_T 58 AVSS
11 TXD7 27 N/C 43 RXD2 59 DVDD
12 TXD8 28 DVDD 44 RXD1 60 DVDD_P
13 TXD9 29 DVDD_T 45 RXD0 61 TX14 DVSS 30 RCLKN 46 DVSS_T 62 TX+
15 DVSS 31 RCLK 47 COM_DET 63 DVDD_P
16 N/C 32 DVSS_T 48 N/C 64 N/C
Pin Name Pin No. Pin Name Pin No. Pin Name Pin No. Pin Name
DVSS 17 N/C 33 DVSS_T 49 N/C
6 Am79761
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