HDMP-1687 データシートの表示（PDF） - HP => Agilent Technologies

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HDMP-1687

Four Channel SerDes Circuit for Gigabit Ethernet and Fibre Channel

HP => Agilent Technologies 

Timing Characteristics for Gigabit Ethernet – Transmitter Section

T = 0°C Ambient to +85°C Case, VCC = 3.15 V to 3.45 V

Symbol

Parameter

Units Min. Typ. Max.

Ttxsetup

Tx Input Setup Time

ns

1.5

Ttxhold

t_txlat[1]

Tx Input Hold Time

Transmitter Latency

ns

0.5

ns

2.3

bits

2.8

Note:

1. The transmitter latency, as shown in Figure 4, is defined as the time between the latching in of the parallel data word (as triggered by the rising edge of

the transmit byte clock, RFCT) and the transmission of the first serial bit of that parallel word (defined by the edge of the first bit transmitted).

Timing Characteristics for Fibre Channel – Transmitter Section

T = 0°C Ambient to +85°C Case, VCC = 3.15 V to 3.45 V

Symbol

Parameter

Units Min. Typ. Max.

Ttxsetup

Tx Input Setup Time

ns

2.0

Ttxhold

t_txlat[1]

Tx Input Hold Time

Transmitter Latency

ns

1.5

ns

3.8

bits

4.0

Note:

1. The transmitter latency, as shown in Figure 4, is defined as the time between the latching in of the parallel data word (as triggered by the rising edge of

the transmit byte clock, RFCT) and the transmission of the first serial bit of that parallel word (defined by the edge of the first bit transmitted).

RFCT

1.4 V

TX [0:3] [0:9]

DATA

DATA

DATA

ttxsetup

Figure 3. Transmitter section timing.

ttxhold

DATA

DATA

2.0 V

0.8 V

TX BYTE A

TX BYTE B

SO [0:3] ± S5 S6 S7 S8 S9 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S0 S1 S2 S3 S4 S5 S6

t_txlat

TX [0:3] [0:9]

TX BYTE B

TX BYTE C

RFCT

Figure 4. Transmitter latency.

4

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