Altera Dynamic Calibrated On-Chip Termination Manuel d'utilisateur télécharger pdf (Page 16)

Chapter 3: Functional Description 3–9

ALTOCT Megafunction Ports

February 2012 Altera Corporation Dynamic Calibrated On-Chip Termination (ALTOCT) Megafunction

User Guide

Output Ports

rup

Yes Pull-up reference resistor Input port

[OCT_BLOCK_NUMBER - 1..0]

wide

s2pload

Yes

Signal used to enable serial

to parallel shifting of

calibrated codes to I/O

buffers

Input port

[OCT_BLOCK_NUMBER - 1..0]

wide

clken

No Clock enable If omitted, value is V

Table 3–2. ALTOCT Megafunction Input Ports

Port Name Required Description Comments

Table 3–3. ALTOCT Megafunction Output Ports

Port Name Required Description Comments

cal_shift_busy

Yes

Specifies the status of

calibration or shifting

operation. This signal is

asserted until the

calibration or shifting

operation is completed.

Output port

[OCT_BLOCK_NUMBER - 1..0]

wide

calibration_busy

Yes

Specifies the status of the

calibration operation. This

signal is asserted until the

calibration operation is

completed.

Output port

[OCT_BLOCK_NUMBER - 1..0]

wide

paralleltermination

control

Yes

Specifies parallel

termination

Receives the current state of the pull-up and

pull-down transmitter control buses from a

termination logic block.

Output port

[OCT_BLOCK_NUMBER * 13..0]

wide

seriesterminationco

ntrol

Yes

Specifies the serial

termination

Receives the current state of the pull-up and

pull-down receiver control buses from a termination

logic block.

Output port

[OCT_BLOCK_NUMBER * 13..0]

wide

1 2 ... 11 12 13 14 15 16 17 18 19

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