LG T5100 Service Manual page 18

Application peripherals
ARM General purposes I/O with keyboard interface and two PWM modulation signals
UART 16C750 interface (UART_IRDA) with
- IRDA control capabilities (SIR)
- Software flow control (UART mode).
UART 16C750 interface (UART_MODEM) with
- hardware flow protocol (DCD, CTS/RTS)
- autobaud function
SIM Interface.
TPU(Time Processing Unit) : Processing for GSM time base
TSP(Time Serial Port) : GSM data interface with RF and ABB
Memory Interface : External/Internal Memory Interface
nCS0 : FLASH1-2, 16bit access, 3 wait state
nCS1 : FLAHS1-1, 16bit access, 3 wait state
nCS2 : FLASH2-1 16bit access, 3wait state
nCS3 : Ext PSRAM, 16bit access, 3 wait state
nCS4 : MIDI(8bit access), DSP(16bit access),USB(8bit) addressing( See Fig 11 )
nCS6 : Int SRAM, 32bit access, 0 wait state
Calypso is internally 39MHz machine (25ns machine cycle), so it requires 3 wait-state for 80ns
access(25 4 =100 ns).
MFI_CS
MIDI_CS
USB_CS
Figure 11. MIDI,DSP,USB Encoding block
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2. TECHNICAL BRIEF
_CS4 A(22) A(21)
0 0 1
0 1 0
0 1 1
A(20)
1
1
0