ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 39

• Manufacturer Part Number: ks8701
• Description: Flextm Roaming Decoder Ii
• Manufacturer: Samsung Semiconductor, Inc.

Decoder-to-Host Packet Descriptions
cases the packets are sent MSB first (bit 7 of byte 3 = bit 31 of the packet = MSB). The KS8701 decides what
data should be sent to the host. If the KS8701 is disabled through the checksum feature (see “ Checksum Packet”
on page 16 for a description of the checksum feature) the Part ID Packet will be sent. Data Packets relating to
data received over the air are buffered in the 32 packet transmit buffer. The Data packets include Block
Information Word Packets, Address Packets, Vector Packets, and Message Packets.
sent. If there is no receiver shutdown packet pending, but there is a roaming status packet pending, the roaming
status packet will be sent. If neither the receiver shutdown packet nor the roaming status packet is pending and
there is data in the transmit buffer, a packet from the transmit buffer will be sent. Otherwise, the KS8701 will send
the Status Packet (which is not buffered). In the event of a buffer overflow, the KS8701 will automatically stop
decoding and clear the buffer.
to read a status packet. This would ensure that any applicable Status Packet would be received within 1 block of
the new status being available.
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The following sections describe the packets of information that will be sent from the KS8701 to the host. In all
If the KS8701 is enabled and a receiver shutdown packet is pending, the receiver shutdown packet will be
It is recommended that the Host be designed to empty the FIFO buffer every block with enough time left over
Receiver Shutdown Register
Roaming Status Register
DECODER-TO-HOST PACKET DESCRIPTIONS
32x32 Data Packet
Part ID register
Status register
FIFO Transmit
Figure 10: FLEX decoder IC SPI Transmit Functional Block Diagram
Buffer
FLEX
32
32
32
32
32
TM
Roaming Decoder II
32
SPI Transmit Register
MISO
KS8701