PSB2115HV1.2 Lantiq, PSB2115HV1.2 Datasheet - Page 61

• Manufacturer Part Number: PSB2115HV1.2
• Manufacturer: Lantiq

Specifications of PSB2115HV1.2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

• Local D-channel source commences with D data transmission on IOM-2 as long as it
• After D-channel data transmission is completed the controller sets the BAC bit to
• IPAC S-transceiver pulls S/G bit to ONE (’Ready’ state) to block the D-channel
• IPAC S-transceiver transmits non-inverted echo (E = D).
• IPAC S-transceiver pulls S/G bit to ZERO (’Idle’ state) as soon as n D-bits = ’1’ are
1. NT 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 IPAC S-transceiver thus receives BAC = “1” (IOM-2 DU line) and transmits
S/G = “0” (IOM-2 DD line). The access will then be established according to the 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-2 and starts
• IPAC S-transceiver transmits inverted echo channel (E bits) on the S-bus to block all
Note: Right after transmission the S/G bit is pulled to ’1’ until n successive D-bits = ’1’
Figure 19 illustrates the signal flow in an intelligent NT and the algorithm of the D-
channel priority handler on IOM-2 implemented in the IPAC.
Semiconductor Group
higher priority requests transmission.
D-channel transmission.
connected S-bus terminals (E = D).
receives S/G = “0”.
ONE.
controller on IOM-2.
counted on IOM-2 (see note) to allow for further D-channel access.
occur on the IOM-2 interface. As soon as n D-bits = ’1’ are seen, the S/G bit is set
to ’0’ and the IPAC D-channel controller may start transmission again. This allows
an equal access for D-channel sources on IOM-2 and on the S interface.
The number n depends on configuration settings (selected priority 8 or 10) and the
condition of the previous transmission, i.e. if an abort was seen (n = 8 or 10,
respectively) or if the last transmission was successful (n = 9 or 11, respectively).
61
Functional Description
PSB 2115
PSF 2115
11.97