Atmel SpaceWire Router SpW-10X Manual de usuario descargar pdf (Pagina 81)

Ref.:

UoD_SpW-10X_

UserManual

Issue:

3.4

SpW-10X

SpaceWire Router

User Manual

Date:

July 2008

Preliminary

DOUT

SOUT

DIN

SIN

Connection made Data Transfer Disconnect

Deactivated

Return NULLs

Disconnect

Detected

Data Received

NULL received

Activate output

DS reset

Deactivate output

Deactivated

Figure 8-1 Deactivate driver operating mode

Note the DOUT deactivate driver/disable is performed one CLK cycle before the SOUT deactivate,

avoiding any simultaneous transitions on Data or Strobe.

When the LVDS drivers are deactivated the equivalent circuit of these outputs is a shown in Figure

8-2.

3.3V

Out+

Out‐

2850Ω 2850Ω

1725Ω 1725Ω

Vdd

Vss

Deactivated=

NMOS

Transistorsoff

Figure 8-2 Deactivated LDVS driver output

When external bias resistors are being used (see section 5.2.2) and a deactivated LVDS output is

connected to a powered LVDS input with external bias resistors the equivalent circuit is as shown in

Figure 8-3.

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 154 155

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Atmel SpaceWire Router SpW-10X Manual de usuario Pagina 81

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