ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 13

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

SPI Packets
PACKET COMMUNICATION INITIATED BY THE FLEX DECODER IC
no data to send, it is suggested that the host send a Checksum Packet with all of the data bits set to 0 in order to
avoid disabling the KS8701. See “Checksum Packet” on page 16 for more details on enabling and disabling the
KS8701.
packets are initiated by the KS8701.
12
Refer to figure 7 on page 12. When the KS8701 has a packet for the host to read, the following occurs:
When the host is reading a packet from the KS8701, it must send a valid packet to the KS8701. If the host has
The following figure illustrates that it is not necessary to de-select the KS8701 between packets then the
Figure 8: Multiple Packet Communications Initiated by the FLEX decoder IC with No De-select
READY
READY
______
MOSI
MISO
1.
2.
3.
4. The host de-selects the KS8701 by driving the SS pin high (optional).
MOSI
MISO
SCK
SS
SCK
Figure 7: Typical Multiple Packet Communications Initiated by the FLEX decoder IC
SS
The KS8701 drives the READY pin low.
If the KS8701 is not already selected, the host selects the KS8701 by driving the SS pin low.
The host receives (and sends) a 32-bit packet.



D31
D31
D31
D31
D1
D1 D0
D1
D1 D0
D0

D0
FLEX
TM
High-impedance state
High impedance state
Roaming Decoder II
D31
D31
D31
D31
D1
D1
D1
D1
D0
D0
D0
D0
D31
D31
D31
D31
D1
D1
D1
D1
D0
D0
D0
D0
KS8701