SC3200 datasheet(422/447 Pages) AMD

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AMD Geode™ SC3200 Processor Data Book

Electrical Specifications

Revision 5.1

9.3.10

Serial Port (UART)

Figure 9-41. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Diagram

Table 9-29. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Parameters

Symbol

Parameter

Min

Max

Unit

Comments

tBT

Single bit time in UART and

Sharp-IR

tBTN - 25

(Note 1)

tBTN + 25

Transmitter

tBTN - 2%

tBTN + 2%

Receiver

tCMW

Modulation signal pulse width in

Sharp-IR and Consumer

Remote Control

tCWN - 25

(Note 2)

tCWN + 25

Transmitter

500

Receiver

tCMP

Modulation signal period in

Sharp-IR and Consumer

Remote Control

tCPN - 25

(Note 3)

tCPN + 25

Transmitter

tMMIN

(Note 4)

tMMAX

(Note 4)

Receiver

tSPW

SIR signal pulse width

(3/16) x tBTN - 15

(Note 1)

(3/16) x tBTN + 15

(Note 1)

Transmitter, Variable

1.48

1.78

µs

Transmitter, Fixed

µs

Receiver

SDRT

SIR data rate tolerance % of

nominal data rate

± 0.87%

Transmitter

± 2.0%

Receiver

tSJT

SIR leading edge jitter % of

nominal bit duration

± 2.5%

Transmitter

± 6.5%

Receiver

Note 1. tBTN is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is determined by the

setting of the Baud Generator Divisor registers.

Note 2. tCWN is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is

determined by the MCPW field (bits [7:5]) of the IRTXMC register and the TXHSC bit (bit 2) of the RCCFG register.

Note 3. tCPN is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is deter-

mined by the MCFR field (bits [4:0]) of the IRTXMC registerand the TXHSC bit (bit 2) of the RCCFG register.

Note 4. tMMIN and tMMAX define the time range within which the period of the incoming subcarrier signal has to fall in order

for the signal to be accepted by the receiver. These time values are determined by the contents of register IRRXDC

and the setting of the RXHSC bit (bit 5) of the RCCFG register.

tBT

tSPW

tCMP

UART

Sharp IR

Consumer

Remote

SIR

tCMW

Control

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