CYWUSB6935 Cypress Semiconductor Corporation., CYWUSB6935 Datasheet - Page 15

• Manufacturer Part Number: CYWUSB6935
• Description: Lr 2.4-ghz Dsss Radio Soc
• Manufacturer: Cypress Semiconductor Corporation.

Note:
Document #: 38-16008 Rev. *D
Bit
7:0
Bit
7:0
Bit
63:0
5.
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
The Valid bit in the Transmit SERDES Valid register (Reg 0x10) is used to mark whether the radio will send data or preamble during that bit time of the data
byte. Data is sent LSB first. The SERDES will continue to send data until there are no more VALID bits in the shifter. For example, writing 0x0F to the Transmit
SERDES Valid register (Reg 0x10) will send half a byte.
Name Description
Data
Name
Valid
Name
PN Codes
7
7
Address 0x18
Address 0x14
Addr: 0x0F
Addr: 0x10
Addr: 0x18-11
[5]
Transmit Data. The over-the-air transmitted order is bit 0 followed by bit 1, followed by bit 2, followed by bit 3, followed by bit 4,
followed by bit 5, followed by bit 6, followed by bit 7.
Description
The Valid bits are used to determine which of the bits in the Transmit SERDES Data register (reg 0x0F) are valid.
1 = Valid transmit bit
0 = Invalid transmit bit
Description
The value inside the 8 byte PN code register is used as the spreading code for DSSS communication. All 8 bytes can be
used together for 64 chips/bit PN code communication, or the registers can be split into two sets of 32 chips/bit PN codes
and these can be used alone or with each other to accomplish faster data rates. Not any 64 chips/bit value can be used
as a PN code as there are certain characteristics that are needed to minimize the possibility of multiple PN codes interfering
with each other or the possibility of invalid correlation. The over-the-air order is bit 0 followed by bit 1... followed by bit 62,
followed by bit 63.
6
6
5
5
Address 0x17
Address 0x13
Figure 7-15. Transmit SERDES Valid
Figure 7-14. Transmit SERDES Data
Figure 7-16. PN Code
4
REG_TX_VALID
4
REG_TX_DATA
REG_PN_CODE
Data
Valid
3
3
Address 0x16
Address 0x12
2
2
9
8
7
0x1E8B6A3DE0E9B222
6
1
1
CYWUSB6935
Default: 0x00
Default: 0x00
5
Address 0x15
Address 0x11
Default:
4
3
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