100BASE-TX DIGITAL BLOCKS
KS8910 100/10 Mbps ETHERNET TRANSCEIVER
4-12
Preliminary Spec. ver
1.4
LINK MONITOR
The Link Monitor process is responsible for determining whether the underlying receive channel is providing
reliable data. Failure of the underlying channel typically causes the PMA’s client to suspend normal actions. The
Link Monitor process takes advantage of the PMD sublayer’s continuously-signaled transmission scheme, which
provides the PMA with a continuous indication of signal detection on the channel through SIGNAL_STATUS as
communicated by the PMD_SIGNAL.indicated primitive. It responds to control by Auto-negotiation.
The Link Monitor process monitors SIGNAL_STATUS and sets link_status to FAIL whenever SIGNAL_STATUS is
OFF or when Auto-negotiation sets link_control to DISABLE. The link is deemed to be reliably operating when
SIGNAL_STATUS has been continuously ON for a certain period of time. If so qualified, Link Monitor sets
link_status to READY in order to synchronize with Auto-negotiation. Auto-negotiation permits full operation by
setting link_control to ENABLE. Figure 4-8 shows the state diagram for the Link Monitor
Figure 4-8. Link Monitor State Diagram of KS8910
HYSTERESIS
LINK READY
LINKUP
BEGIN(pwon_reset)
(SIGNAL_STATUS = OFF) +
(link_control = DISABLE) +
(faulting = TRUE)
link_status
=
FAIL
SIGNAL_STATUS = ON
Start stabilize_timer
stabilize_timer_done
link_status=READY
link_control = ENABLE
link_status=OK
link_control = SCAN_FOR_CARRIER
LINK DOWN
Summary of Contents for KS8910
Page 1: ...20 8910 0599 USER S MANUAL KS8910 100 10 Mbps Ethernet Transceriver PHY Preliminary ...
Page 4: ...PRELIMINARY SPECIFICATION vi KS8910 100 10 Mbps ETHERNET CONTROLLER ...
Page 21: ...EXTERNAL SIGNALS KS8910 100 10 Mbps ETHERNET TRANSCEIVER 2 8 Preliminary Spec ver 1 4 MEMO ...
Page 89: ...APPLICATION NOTE KS8910 100 10 Mbps ETHERNET TRANSCEIVER 9 2 Preliminary Spec ver 1 4 MEMO ...
Page 91: ...MECHANICAL DATA KS8910 100 10 Mbps ETHERNET TRANSCEIVER 10 2 Preliminary Spec ver 1 4 MEMO ...
Page 99: ...A 8 APPENDIX KS8910 100 10 Mbps ETHERNET TRANSCEIVER Preliminary Spec ver 1 4 NOTES ...