cxd1944r Sony Electronics, cxd1944r Datasheet - Page 13

• Manufacturer Part Number: cxd1944r
• Description: Ieee1394 3-port 200mbps Cable Transceiver/arbiter
• Manufacturer: Sony Electronics

CTL [0 : 1] When the LINK is Driving (upon a grant from PHY)
Twisted Pair Cable Connection
CTL [0 : 1] When PHY is Driving
Description of Operation
the CXD1940R to configure a high speed serial bus. It
has three ports which support speeds of 100M/200Mbps.
the interface: request, status, transmit, and receive. All
bit request are initiated by the PHY. The LINK uses the
CTL [0: 1]
CTL [0: 1]
The CXD1994R is used with LINK controllers such as
There are four basic operations which may occur in
00
01
10
11
00
01
10
11
Idle
Hold
Transmit
Reserved
Idle
Status
Receive
Transmit
Name
Name
Cable Port (n)
Transmission complete, release bus.
The LINK is holding the bus while preparing data or indicating it wishes to
reacquire the bus without arbitration to send another packet.
The LINK is sending a packet to the PHY.
Unused.
No activity.
The PHY is sending status information to the LINK.
An incoming packet is being transferred from the PHY to the LINK.
The LINK is granted the bus to send a packet.
CPS
TPBn+
TPBSn
TPAn+
TPAn–
TPBn–
55
0.33µF
200k
–13–
55
250pF
request operation to read or write an internal PHY regis-
ter or to ask the PHY to initiate a transmit action. The
PHY initiates a receive action whenever a packet is
received from the serial bus.
speed.
55
The serial bus is always 2 bits wide, independent of
The encoding of these pins is as follows:
Power pair
Meaning
Meaning
55
5k
Cable pair A
Cable pair B
CXD1944R