Document Outline
- Am79761
- GENERAL DESCRIPTION
- BLOCK DIAGRAM
- CONNECTION DIAGRAM
- LOGIC SYMBOL
- ORDERING INFORMATION
- RELATED PRODUCTS
- PIN DESIGNATION
- PIN DESCRIPTION
- FUNCTIONAL DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- OPERATING RANGES
- KEY TO SWITCHING WAVEFORMS
- AC CHARACTERISTICS
- REFERENCE CLOCK REQUIREMENTS
- MEASUREMENTS
- THERMAL CONSIDERATIONS
- PHYSICAL DIMENSIONS
PRELIMINARY
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
Am79761
Physical Layer 10-Bit Transceiver for Gigabit Ethernet
(GigaPHYTM-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 Serial-
izer/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 sup-
port 1000BASE-CX applications.
The functions performed by the device include serializ-
ing the 8B/10B 10-bit data for transmission, deserializ-
ing received code groups, recovering 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. Option-
ally, it detects comma characters used to align the in-
coming word.
2
Am79761
P R E L I M I N A R Y
BLOCK DIAGRAM
D Q
Q D
Serial to
Parallel
Parallel
to Serial
RX+
RX-
Frame
Logic
10
TX+
TX-
EWRAP
RXD[0:9]
RCLK
RCLKN
COM_DET
EN_CDET
TXD[0:9]
REFCLK
PLL Clock
Multiply
10
10
20
Clock
Recovery
Comma
Detect
21560A-1
Am79761
3
P R E L I M I N A R Y
CONNECTION DIAGRAM
LOGIC SYMBOL
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DVSS
TXD0
TXD1
TXD2
DVDD
TXD3
TXD4
TXD5
TXD6
DVDD
TXD7
TXD8
TXD9
DVSS
DVSS
N/C
N/C
COM_DET
DVSS_T
RXD0
RXD1
RXD2
DVDD_T
RXD3
RXD4
RXD5
RXD6
DVDD_T
RXD7
RXD8
RXD9
DVSS_T
N/C
TEST1
EWRAP
TEST2
DVSS
REFCLK
TEST3
EN_CDET
DVSS
TEST4
N/C
DVDD
DVDD_T
RCLKN
RCLK
DVSS_T
N/C
DVDD_P
TX+
TX-
DVDD_P
DVDD
AVSS
AVDD
DVSS
DVDD
RX+
DVDD_P
RX-
DVSS
DVDD
N/C
21560A-2
Note:
N/C = No Connect
Am79761
GigaPHY-SD
DVDD
DVDD_T
DVDD_P
AVDD
DVSS
DVSS_D
DVSS
REFCLK
RCLK
RCLKN
EN_CDET
EWRAP
COM_DET
TEST4
TDST [3:1]
TXD [0:9]
RXD [0:9]
TX+
TX
RX+
RX
To PCS
Transceiver
PHY
Control
Test
Port
21560A-3
4
Am79761
P R E L I M I N A R Y
ORDERING INFORMATION
Standard Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed
by a combination of the elements below.
Valid Combinations
Valid Combinations list configurations planned to be sup-
ported 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.
DEVICE NUMBER/DESCRIPTION
Am79761
Physical Layer 10-Bit Transceiver for Gigabit Ethernet
GigaPHYTM-SD)
PACKAGE SIZE OPTION
-10 = 10 x 10 mm body size
-14 = 14 x 14 mm body size
TEMPERATURE RANGE
C = Commercial (0C to +70C)
Am79761
C
Y
PACKAGE TYPE
Y = 64-Pin Plastic Quad Flat Pack (PDH064)
-10
Valid Combinations
Am79761YC
Am79761YC
-10
-14
Am79761
5
P R E L I M I N A R Y
RELATED PRODUCTS
Part No.
Description
Am7990
Local Area Network Controller for Ethernet (LANCE)
Am7992B
Serial Interface Adapter (SIA)
Am7996
IEEE 802.3/Ethernet/Cheapernet Transceiver
Am79C90
CMOS Local Area Network Controller for Ethernet (C-LANCE)
Am79C98
Twisted Pair Ethernet Transceiver (TPEX)
Am79C100
Twisted Pair Ethernet Transceiver Plus (TPEX+)
Am79C871
Quad Fast Ethernet Transceiver for 100BASE-X Repeaters (QFEXrTM)
Am79C981
Integrated Multiport Repeater Plus (IMR+TM)
Am79C982
basic Integrated Multiport Repeater (bIMRTM)
Am79C983
Integrated Multiport Repeater 2 (IMR2TM)
Am79C984A
enhanced Integrated Multiport Repeater (eIMRTM)
Am79C985
enhanced Integrated Multiport Repeater Plus (eIMR+TM)
Am79C987
Hardware Implemented Management Information Base
(HIMIBTM)
Am79C988A
Quad Integrated Ethernet Transceiver (QuIETTM)
Am79C900
Integrated Local Area Communications Controller (ILACCTM)
Am79C940
Media Access Controller for Ethernet (MACETM)
Am79C960
PCnetTM-ISA Single-Chip Ethernet Controller (for ISA bus)
Am79C961
PCnetTM-ISA+ Single-Chip Ethernet Controller for ISA (with Microsoft Plug n' Play Support)
Am79C961A
PCnetTM-ISA II Full Duplex Single-Chip Ethernet Controller for ISA
Am79C965
PCnetTM-32 Single-Chip 32-Bit Ethernet Controller
Am79C970
PCnetTM-PCI Single-Chip Ethernet Controller (for PCI bus)
Am79C970A
PCnetTM-PCI II Full Duplex Single-Chip Ethernet Controller (for PCI bus)
Am79C971
PCnetTM-
FAST
Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
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