BCM5208KPF Broadcom, BCM5208KPF Datasheet - Page 45

• Manufacturer Part Number: BCM5208KPF
• Manufacturer: Broadcom

Specifications of BCM5208KPF

• Number Of Receivers: 4
• Data Rate: 10/100Mbps
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3.14V
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Lead Free Status / RoHS Status: Not Compliant

November 3, 1999
Table 29 provides the parameters for 100BASE-X transmit timing. Figure 4 illustrates 100BASE-TX transmit start of packet
timing and Figure 5 shows the 100BASE-TX transmit end of packet timing.
Document 5208-DS03-R¥¥¥¥¥
PARAMETER
TXC Cycle Time
TXC High/Low Time
TXC Rise/Fall Time
TXEN, TXER, TXJAM, TXD[3:0] Setup Time to TXC
rising*
TXEN, TXER, TXJAM, TXD[3:0] Hold Time from TXC
rising*
TD± after TXEN Assert
TXD to TD± Steady State Delay
CRS Assert after TXEN Assert
CRS Deassert after TXEN Deassert
COL Assert after TXEN Assert (while RX)
COL Deassert after TXEN Deassert (while RX)
TXEN, TXER, TXJAM, TXD[3:0] Setup Time to CK25
rising*
TXEN, TXER, TXJAM, TXD[3:0] Hold Time from
CK25 rising*
* The BCM5208 will function properly if the TXEN, TXER, TXJAM and TXD[3:0] inputs meet the setup and hold times to
either the TXC (Switch) output or the CK25 (Repeater) input.
CLOCK
TXEN
TXD,
TXER
TD±
CRS
COL
Note 1
Note 1:
CLOCK will be:
*
TXC in DTE mode
CK25 in 100BASE-T Repeater Mode
I
TXEN_HOLD
I
I
X
I
Figure 4: Transmit Start of Packet Timing (100BASE-TX)
I
I
I
Table 29: 100BASE-X Transmit Timing
I
5
TXEN_CRS
TXEN_COL
I
B r o a d c o m C o r p o r a t i o n
TXEN_SETUP
TX_TDATA
I
SYMBOL
TXEN_SETUP
TXEN_HOLD
TXEN_TDATA
TXD_TDATA
TXEN_CRS
TXEN_CRS_EOP
TXEN_COL_EOP
I
TXEN_COL
I
I
5
J4 J3 J2
*
When receive is active
J1
MIN
J0
16
12
60
60
10
2
0
–
–
–
–
2
5
SSD
K4 K3 K2 K1 K0
TXD_TDATA
TYP
40
20
–
–
–
–
–
–
–
–
–
–
–
5
MAX
24
80
80
30
30
30
30
n BCM5208
5
–
–
3RD DATA
NIBBLE
UNIT
Page 37
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns