PEF81902FV1.1 Lantiq, PEF81902FV1.1 Datasheet - Page 69

• Manufacturer Part Number: PEF81902FV1.1
• Manufacturer: Lantiq

Specifications of PEF81902FV1.1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

•
Figure 29
1. Local D-Channel Controller Transmits Upstream
In the initial state (’Ready’ state) neither the local D-channel sources nor any of the
terminals connected to the S-bus transmit in the D-channel.
The T-SMINT
S/G = “1” (IOM
following procedure:
• Local D-channel source verifies that BAC bit is set to ONE (currently no bus access).
• Local D-channel source issues TIC bus address and verifies that no controller with
• Local D-channel source issues BAC = “0” to block other sources on IOM
• T-SMINT
1)
Data Sheet
higher priority requests transmission (TIC bus access must always be performed even
if no other D-channel sources are connected to IOM
announce D-channel access.
CNT
If the S-transceiver is reset by SRES.RES_S = ’1’ or disabled by S_CONF0.DIS_TR = ’1’, then the D-channel
arbiter is in state Ready (S/G = ’1’), too. The S/G evaluation of the HDLC has to be disabled in this case;
otherwise, the HDLC is not able to send data.
2) Setting A/B = 0 causes E = D
1) Setting DCI = 1 causes E = D
& [BAC = 1 or (BAC = 0 & CNT
BAC = d.c. DCI = 0
S/G = 1
n (see note) to allow sending D-channel data from the entitled source.
(CNT
S ACCESS
â
IX S-transceiver pulls S/G bit to ZERO (’Local Access’ state) as soon as
â
State Machine of the D-Channel Arbiter (Simplified View)
IX S-transceiver thus receives BAC = “1” (IOM
â
2 & D=0)
-2 DD line). The access will then be established according to the
E = D
1)
n)]
(BAC=0 or DCI=1)
RST=0, A/B=0, Mode=0xx
BAC = 1 & DCI = 0
S/G = 1
& CNT
55
READY
D-Channel_Arbitration.vsd
n
E = D
1)2)
(BAC=1 & DCI=0)
â
-2).
CNT
â
OUT
-2 DU line) and transmits
IN
Functional Description
BAC
S/G
BAC = d.c. DCI = d.c.
S/G = 0
BAC = 0 or DCI = 1
S/G = 0
State
Transmit / Stop Flag
Wait for Start Flag
LOCAL ACCESS
LOCAL ACCESS
DCI
PEF 81902
E
1)
â
2001-11-12
-2 and to
CNT = 6
E = D
E = D