HP HGLM-1063 Datasheet
Fibre Channel GBaud Optical
Link Module
Technical Data
HGLM-1063
Features
• ANSI X3.230-1994 Fibre
Channel Standard
Compatible (FC-0)
• FCSI-301-Rev 1.0 “GBaud
Link Module Specification”
Compatible
• Standard 20 Bit (1063 MBd),
TTL Interface
• Class I Laser Safety
Certified
• Single +5.0 V Power Supply
Applications
• Mass Storage System I/O
Channel
• Computer System I/O
Channel
• High Speed Peripheral
Interface
Description
The HGLM-1063 Gigabaud
Optical Link Module, provides a
complete Fibre Channel FC-0
layer solution. The module meets
the requirements of the 100-M5-
SL-I physical link as defined by
the American National Standards
Institute (ANSI) X3.230-1994
Fibre Channel standard. The
HGLM-1063 is also compatible
with the Fibre Channel Systems
Initiative (FCSI) document
#FCSI-301-Rev 1.0 “Gigabaud
Optical Link Module”
specification.
The HGLM-1063 transmits and
receives 8b/10b encoded,
parallel, data in the 20 bit wide
format defined by the FCSI-301
document. The 20 bit wide data is
transmitted at 100MB/sec over a
serial fiber link and has the
capability to receive data at
100 MB/sec simultaneously. With
overhead, this translates to a
serial line rate of 1062.5 MBaud
transmitting and 1062.5 MBaud
receiving. The serial data link
uses a 780 nm laser transmitter
and photodiode. The optimum
fiber is 50/125 µm multimode
fiber (62.5/125 µm multimode
fiber can be used with degraded
performance) and attaches to the
HGLM-1063 via a duplex SC
connector.
As specified in the Fibre Channel
Standard, the HGLM-1063 is a
Class 1 laser safe device; the
transmitted optical signal shuts
down in the case of an open fiber
condition after a specific time
interval. The HGLM-1063
accomplishes this by monitoring
the transmitted optical power
levels, and the received optical
signal.
The HGLM-1063 is intended for
use in building adapter cards (or
equivalent devices) as shown in
Figure 1. The HGLM-1063 provides complete FC-0 functionality.
The HPFC-5000 provides the
FC-1 through FC-4 functions and
interfaces directly to the HGLM-
1063. Finally, a bus gasket is
used to connect the HPFC-5000
to the specific system bus in use.
This block diagram is meant only
to illustrate the basic Fibre
Channel functionality.
For proper operation, it is
necessary to connect the HGLM1063 to another HGLM-1063 (or
equivalent) in a full duplex
configuration as depicted in
Figure 3. This ensures proper
operation of the Open Fiber
Control circuitry and allows
proper link startup and
synchronization.
726
5964-6638E (4/96)
HPFC-5000
TACHYON
SYSTEM BUS
Figure 1. Example System Adapter Card, Block Diagram (Simplified).
BUS GASKET
HGLM-1063
GIGABAUD OPTICAL
LINK MODULE
Tx
FIBER
Rx
Functional Description
A simplified block diagram of the
HGLM-1063 module is shown in
Figure 2. This block diagram
shows the 5 key elements of the
module. These are the Transmitter I.C., the Laser Diode Assembly,
the Receiver I.C., the photodiode
assembly, and the Open Fiber
Control circuit. The high level of
integration on the HGLM-1063 is
apparent from this block
diagram. Pin assignments and
signal definitions are given on
pages 6 and 7.
In general, the HGLM-1063
utilizes a user provided Transmit
Byte Clock (TBC) of 53.125 MHz
to transmit two 8b/10b encoded
data bytes, simultaneously, by
creating a serial data stream of
1062.5 MBd and modulating a
780 nm laser diode with it. The
20 bit wide (two encoded bytes)
data input is provided to the
module through the 80 pin connector in standard TTL format.
Similarly, the HGLM-1063
receives 780 nm optical signals at
a data rate of 1062.5 MBd,
deserializes this data stream to
recover the two encoded data
bytes and provides this 20 bit
wide standard TTL data to the
receiving system via the 80 pin
connector. The receiver also
recovers the byte rate clock for
use in clocking the received 20
bit wide parallel data.
Link Acquisition and Power Up
The following discussion assumes
the HGLM-1063 is connected in a
full duplex point to point link as
shown in Figure 3. When initially
applying power to the HGLM1063, the Transmit Byte Clock
must start no later than 5 msec
after the +5 volt supply reaches
the +4 volt level. If this requirement is not met, the Open Fiber
Control (OFC) circuit may stick
in a nonfunctional state. If this
should happen, the OFC can be
put into a functional state by
holding the Enable Wrap
(EWRAP) line high for 10.5
seconds. Once the TBC is
running, and the module is
properly powered up, the following sequence should be followed
to bring the link into full
synchronization and ready to
transmit data:
1. Both Link Unusable lines will
be driven high, by the OFC,
indicating neither receiver is
detecting a signal from the link.
2. Drive the Transmit Data lines,
Tx[00:19] to a
01010101010101010101.
3. Drive the input control lines as
follows:
• Enable Wrap: low
• Tx_SI: low
• Enable Comma Detect: high
• -Lock to Reference: high
4. Assuming the link is properly
connected, and both link ends are
in the same state of readiness, the
lasers will turn on in 10.1
seconds. This will be indicated by
the Link Unusable lines going
low. This transition indicates the
OFC is operational and in
control.
5. Once the lasers have come on,
and Link Unusable is observed to
transition low, bring -Lock to
Reference low for at least
500 µsec. This forces the module
to frequency lock to the Transmit
Byte Clock.
727
± SERIAL DATA IN
± SERIAL DATA OUT
DATA BYTE 0
Tx[00:09]
DATA BYTE 1
Tx[10:19]
EWRAP
Tx_SI
TBC
FIBER INPUT
EN_CDET
-LCK_REF
HDMP-1512
TRANSMITTER
I.C.
PHOTODIODE
ASSEMBLY
FAULT
-LZON
OPEN FIBER
CONTROL
Figure 2. HGLM-1063 Functional Block Diagram.
CLOCK (TBC)
Tx
ENCODED DATA
FIBER PATH A
I.C.
LOL A, B
LASER DIODE
ASSEMBLY
HDMP-1514
RECEIVER
I.C.
Rx
FIBER OUTPUT
FAULT
L_UNUSE
RBC[0:1]
DATA BYTE 0
Rx[00:09]
DATA BYTE 1
Rx[10:19]
COM_DET
CLOCK (RBC[0:1])
ENCODED DATA
HGLM1 HGLM2
ENCODED DATA
CLOCK (RBC[0:1])
Rx
Figure 3. Full Duplex Point to Point Link.
H
HGLM-1063
780 nm GLM Module
CDRH21 CFR(J) Compilant
Class 1 Laser Product
09 Nov. 1995 San Jose, CA
Made in U.S.A. from domestic
and foreign components.
Rx Tx
Figure 4. Typical HGLM-1063 Label.
FIBER PATH B
Tx
ENCODED DATA
CLOCK (TBC)
728
Loading...