Fifo - CMOSTEK CMT2310A Manual

It should be noted that the BURST read/write does not support an operation crossing pages, that is, a BURST can only be
accomplished within a page. The address ranges supporting the BURST read/write within each page are listed in the table below.
PAGE Start Address
0 0x28
1 0x00
2 0x00
Users can select any starting address within the address range of each Page for continuous BURST read and write operations of
N addresses. The end address cannot exceed the address range according to the value of N. The common way of BURST
reading and writing is to allow users to carry out quick one-time configuration before powering on. The configuration register
content comes from RFPDK tool, and the content of frequency hopping table is designed by users themselves.

5.2 FIFO

The CMT2310A provides two separated 128-byte FIFO by default. They are used for RX and TX respectively. RX FIFO is used to
store received data in Rx mode while TX FIFO is used to store data to be transmitted in Tx mode. Users can also set
FIFO_MARGE_EN to 1 to merge the two separated FIFO into one 256-byte FIFO, which is used both in TX and RX mode. By
configuring the FIFO_RX_TX_SEL, it can indicate whether it is currently used as TX FIFO or RX FIFO. When the two FIFO are
not merged, users can fill in the TX FIFO to prepare for the next transmission meanwhile the RX FIFO is being filled in, thus to
save system operating time.
The FIFO can be accessed via the SPI interface. Users can clear the FIFO by setting FIFO_CLR_TX or FIFO_CLR_RX to 1. Also,
users can re-send the old data in the TX FIFO by setting FIFO_RESTORE to 1, with no need to re-fill the data.
Users can control whether FIFO still store data in sleep mode by configuring PD_FIFO, that is, PD_FIFO = 0 stands for FIFO
storing data in sleep mode, yet with consuming about 200 nA leakage current.
Figure 16. SPI (3-wire) BURST Write Register Timing
End Address The number of addresses
0x77
0x6F
0x3F
Rev 1.0E | Page26/50
80 Configuration registers in Page 0
112 Configuration registers in Page 1
64 Frequency hopping table in Page 2
CMT2310A
Description
www.cmostek.com