RF430CL331HIPWR datasheet(26/63 Pages) TI2

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Reader (PCD)

RF430CL331H (PICC)

Host Controller

ReadBinary command is

sent

Is the data

already

available?

Responds with the

data over the data

bus

No/Interrupt

INTO

Starts

transmitting the

data over RF

Yes

PCD processes the data

and possibly repeats the

cycle

If necessary

Sends the extra

data while the RF

transmission is

ongoing

INTO

Interrupt (Second)

Stores it in the

RAM cache (to be

used later if

necessary)

Then asserts INTO

interrupt

RF430CL331H

SLASE18A – SEPTEMBER 2015 – REVISED NOVEMBER 2015

www.ti.com

5.9.3

NDEF or Capability Container Read Procedure (Prefetch Feature)

The read prefetch feature includes the standard read procedure. However, after the requested data is

written into the RF430CL331H buffer, when the RF430CL331H starts to transmit the requested data over

the air, another interrupt is issued to the host controller indicating that extra data can be appended to the

RF430CL331H buffer. The host controller can start adding data to the buffer while the RF430CL331H is

transmitting over RF, because two tasks are happening at once, this increases the throughput of the

system. For optimum operation, the host controller should cease to write extra data before the next

interrupt. If the host controller does not cease to write, latency is introduced into the system, which can

accumulate until requests start to time out. To determine how much is available to write the prefetch data,

the time to send out the packet (that was requested) over RF can be calculated.

To enable read prefetch feature, the Read Prefetch interrupt must be enabled in the Interrupt Enable

For a general flow, see Figure 5-11.

Figure 5-11. Read System Flow (Prefetch Feature)

Detailed Description

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RF430CL331HIPWR Datasheet(PDF) 26 Page - Texas Instruments

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