VSC8221 datasheet(88/138 Pages) MICROSEMI

88 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

88 of 106

106

24.11:10 - Reserved

24.9:7 – TX FiFO Depth Control1

Bits 24.9:7 control symbol buffering for the transmit synchronization FiFO used in all 1000BT modes. An internal FiFO is used to

synchronize the clock domains between the MAC transmit clock and the PHY’s clock (e.g., REFCLK), used to transmit symbols

on the local PHY’s twisted pair interface.

The iEEE mode supports up to 1518-byte packet size with the minimum inter-packet gap (iPG). The jumbo packet mode adds

latency to the path to support up to 9600-byte packets with the minimum inter-packet gap (iPG). When using jumbo packet

mode, a larger iPG is recommended due to the possible compression of the iPG at the output of the FiFO.

24.6:4 – RX FiFO Depth Control1

Used in 1000BT , bits 24.6:4 control symbol buffering as determined by the receive synchronization FiFO. An internal FiFO is

used to synchronize the clock domains between the MAC receive clock and the PHY’s clock (e.g., REFCLK), used to receive

symbols on the local PHY’s twisted pair interface.

The iEEE mode supports up to 1518-byte packet size with the minimum inter-packet gap (iPG). The jumbo packet mode adds

latency to the path to support up to 9600-byte packets with the minimum inter-packet gap (iPG). When using jumbo packet

mode, a larger iPG is recommended due to the possible compression of the iPG at the output of the FiFO.

24.3:1 – Reserved

24.0 - Connector Loopback

See Section 17.3 on page 51 for details.

23.2.26 Register 25 (19h) – interrupt Mask Register

1The TX and RX FiFOs are not used for 10BASE-T and 100BASE-TX.

Bit

Name

Access States

Reset

Value

Sticky

interrupt Pin Enable

R/W

1 = Enable interrupt pin

0 = Disable interrupt pin

Reserved

Link State-Change interrupt Mask

R/W

1 = Enable Link State/ Energy Detect interrupt

0 = Disable Link State/ Energy Detect interrupt

Reserved

Auto-Negotiation Error interrupt

Mask

R/W

1 = Enable Auto-Negotiation Error interrupt

0 = Disable Auto-Negotiation Error interrupt

Auto-Negotiation-Done / interlock

Done interrupt Mask

R/W

1 = Enable Auto-Negotiation-Done/ interlock Done

interrupt

0 = Disable Auto-Negotiation-Done/ interlock

Done interrupt

inline Powered Device Detected

interrupt Mask

R/W

1 = Enable inline Powered Device Detected inter-

rupt

0 = Disable inline Powered Device Detected inter-

rupt

Symbol Error interrupt Mask

R/W

1 = Enable Symbol Error interrupt

0 = Disable Symbol Error interrupt

Descrambler Lock-Lost interrupt

Mask

R/W

1 = Enable Lock-Lost interrupt

0 = Disable Lock-Lost interrupt

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