AS1163 datasheet(32/91 Pages) AMSOSRAM

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AS1163

Functional description

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The use of the first node is optional but simplifies the MCU interface (ME coding/decoding).

Apart from the items listed below, a “parallel” node is just a regular OSP node.

Parallel nodes shall fulfill the following requirements:

A node becomes a “parallel” node by flashing bit star_net_en in OTP to 1.

Each parallel node has a fixed, hard-wired address mask, applied to the top 3 MSBs of

incoming addresses. This address mask is given either by the OTP field star_net_otp_addr if

otp_add_en bit is set, or from open and short flags of channel 2 green and red colors, when

otp_add_en is not set.

The parallel node address defines an address range for its branch. The address range is

defined as:

Table 9: Address range

Bit 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit3

Bit 2

Bit 1

Bit 0

Address mask [2:0]

If a parallel node receives a telegram with an address not within its address range (except

broadcast and multicast), the telegram is silently discarded.

When branching is enabled via OTP and the branch address range is defined in the OTP too,

nevertheless R1 & G1 are not available as LED drivers.

Broadcast messages are forwarded as usual. Multicast messages are forwarded as usual.

To initiate the nodes on the network, the MCU has to send individual INIT commands to each

of the “parallel” nodes using the respective hardcoded addresses. INIT refers to either

telegram INITBIDIR or INITLOOP.

For example, MCU starts the initialization with the main trunk, e.g. with INIT(0x001), followed

by the initialization of the branches, e.g. INIT(0x080), INIT(0x100) ... INIT(0x080) will start the

initialization procedure of the first branch only and the nodes in this branch will be initialized

with addresses 0x081, 0x082, etc. The nodes of other branches will ignore this initialization

command as it is not addressed to their address range.

Due to the fixed address ranges, there is a discontinuity of addresses between the various

branches before and after the branching point. Therefore, in order to use serial broadcast

commands (see Commands section) each branch has to be addressed individually and only

after the response of the previous branch has been received.

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