SM5903BF compression and non compression type shock-proof memory controller NIPPON PRECISION CIRCUITS INC. Overview The SM5903BF is a compression and non compression type shock-proof memory controller LSI for compact disc players. The compression level can be set in 4 levels, and external memory can be selected from 4 options (1M, 4M, 4M× 2, 16M). It operates from a 2.4 to 3.6 V supply voltage range. Features - 2-channel processing - Serial data input ⋅ 2s complement, 16-bit/MSB first, right-justified format ⋅ Wide capture function - Microcontroller interface ⋅ Serial command write and status read-out ⋅ Data residual detector: 15-bit operation, 16-bit output ⋅ Forced mute (up to 3 × speed input rate) - System clock input ⋅ 384fs (16.9344 MHz) - Shock-proof memory controller ⋅ ADPCM compression method ⋅ 4-level compression mode selectable 4-bit compression mode 2.78 s/Mbit 5-bit compression mode 2.22 s/Mbit 6-bit compression mode 1.85 s/Mbit Full-bit non compression mode 0.74 s/Mbit ⋅ 4 external DRAM configurations selectable - Extension I/O Microcontroller interface for external control using 5 extension I/O pins - +2.4 to +3.6 V operating voltage range - Schmitt inputs All input pins (including I/O pins) except CLK (system clock) - Reset signal noise elimination Approximately 3.8 µs or longer (65 system clock pulses) continuous LOW-level reset - 44-pin QFP package (0.8 mm pin pitch) 1 × 16M DRAM (4M × 4 bits, refresh cycle = 2048 cycle) 1 × or 2 × 4M DRAM (1M × 4 bits) 1 × 1M DRAM (256k × 4 bits) Ordering Information SM5903BF 44pin QFP NIPPON PRECISION CIRCUITS-1 SM5903BF Package dimensions (Unit: mm) 44-pin QFP 12.80 0.30 10.00 0.30 10.00 0.30 (1.40) C0 .7 0.60 0.20 0.15 0.05 4 0.20 1.50 0.10 (1.40) 0 to 10 12.80 0.30 0.17 0.05 0.15 0.80 0.35 0.10 0.20MAX A3 A2 A1 A0 A4 A5 A6 A7 A8 A9 NRAS 44 43 42 41 40 39 38 37 36 35 34 Pinout (Top View) 1 33 NWE UC1 2 32 D1 UC2 3 31 D0 UC3 4 30 D3 UC4 5 29 D2 UC5 6 28 NCAS N.C 7 27 A10/ NCAS2 NTEST 8 26 YMCLK CLK 9 25 YMDATA VSS 10 24 YMLD YSRDATA 11 23 YDMUTE 20 21 22 ZSENSE VDD1 17 YFLAG NRESET 16 ZSRDATA 19 15 ZLRCK 18 14 ZSCK YFCLK 13 YSCK YBLKCK 12 YLRCK SM5 9 0 3 B F VDD2 NIPPON PRECISION CIRCUITS-2 SM5903BF Pin description Pin number Pin name I/O Function Setting 1 VDD2 - VDD supply pin 2 UC1 Ip/O Microcontroller interface extension I/O 1 3 UC2 Ip/O Microcontroller interface extension I/O 2 4 UC3 Ip/O Microcontroller interface extension I/O 3 5 UC4 Ip/O Microcontroller interface extension I/O 4 6 UC5 Ip/O Microcontroller interface extension I/O 5 7 N.C - 8 NTEST Ip Test pin 9 CLK I 16.9344 MHz clock input H Test 10 VSS - Ground 11 YSRDATA I Audio serial input data 12 YLRCK I Audio serial input LR clock 13 YSCK I Audio serial input bit clock 14 ZSCK O Audio serial output bit clock 15 ZLRCK O Audio serial output LR clock 16 ZSRDATA O Audio serial output data 17 YFLAG I Signal processor IC RAM overflow flag 18 YFCLK I Crystal-controlled frame clock 19 YBLKCK I Subcode block clock signal 20 NRESET I System reset pin 21 ZSENSE O Microcontroller interface status output Left channel Right channel Left channel Right channel Overflow Reset 22 VDD1 - VDD supply pin 23 YDMUTE I Forced mute pin 24 YMLD I Microcontroller interface latch clock 25 YMDATA I Microcontroller interface serial data 26 YMCLK I Microcontroller interface shift clock 27 A10 O DRAM address 10 Mute (NCAS2) O DRAM2 CAS control (with 2 DRAMs) 28 NCAS O DRAM CAS control 29 D2 I/O DRAM data input/output 2 30 D3 I/O DRAM data input/output 3 31 D0 I/O DRAM data input/output 0 32 D1 I/O DRAM data input/output 1 33 NWE O DRAM WE control 34 NRAS O DRAM RAS control 35 A9 O DRAM address 9 36 A8 O DRAM address 8 37 A7 O DRAM address 7 38 A6 O DRAM address 6 39 A5 O DRAM address 5 40 A4 O DRAM address 4 41 A0 O DRAM address 0 42 A1 O DRAM address 1 43 A2 O DRAM address 2 44 A3 O DRAM address 3 Ip : Input pin with pull-up resistor L Ip/O : Input/Output pin (With pull-up resistor when in input mode) NIPPON PRECISION CIRCUITS-3 SM5903BF Absolute maximum ratings (VSS = 0V, VDD1, VDD2 pin voltage = VDD) Parameter Symbol Rating Unit Supply voltage Input voltage VDD - 0.3 to 4.6 V VI VSS - 0.3 to VDD + 0.3 V Storage temperature TSTG - 55 to 125 ˚C Power dissipation PD 350 mW Soldering temperature TSLD 255 ˚C Soldering time tSLD 10 sec Note. Refer to pin summary on the next page. Values also apply for supply inrush and switch-off. Electrical characteristics Recommended operating conditions (VSS = 0V, VDD1, VDD2 pin voltage = VDD) Parameter Symbol Rating Unit Supply voltage VDD 2.4 to 3.6 V Operating temperature TOPR - 40 to 85 ˚C DC characteristics Standard voltage:(VDD1 = VDD2 = 3.0 to 3.6 V, VSS = 0 V, Ta = - 40 to 85 ˚C) Parameter Pin Symbol Condition Current consumption VDD IDD (*A)SHPRF ON Input voltage CLK Rating Min (*A)Through mode H level (*5) Output voltage (*4,6) (*5,7) Input current Input leakage current CLK Max 4.5 8.0 mA 1.8 3.0 mA V 0.3VDD VIL1 VINAC (*2,3,4) Typ 0.7VDD VIH1 L level Unit AC coupling H level VIH2 L level VIL2 H level VIH3 L level VIL3 H level VOH1 IOH = - 0.5 mA L level VOL1 IOL = 0.5 mA H level VOH2 IOH = - 0.5 mA L level VOL2 IOL = 0.5 mA 1.0 V VP-P 0.7VDD V 0.3VDD 0.6VDD V V 0.2VDD VDD - 0.4 V V 0.4 VDD - 0.4 V V 0.4 V IIH1 VIN = VDD 5 15 115 µA IIL1 VIN = 0V 5 15 115 µA 1 2.5 (*3,4) IIL2 VIN = 0V 15 µA (*2,3,4,5) ILH VIN = VDD 1.0 µA (*2,5) ILL VIN = 0V 1.0 µA (*A) VDD1 = VDD2 = 3 V, CLK input frequency fXTI= 384fs = 16.9344 MHz, all outputs unloaded, SHPRF: Shock-proof, typical values are for VDD1 = VDD2 = 3 V. NIPPON PRECISION CIRCUITS-4 SM5903BF Low-voltage:(VDD1 = VDD2 = 2.4 to 3.0 V, VSS = 0 V, Ta = - 20 to 70 ˚C) Parameter Pin Symbol Condition Current consumption VDD IDD (*B)SHPRF ON Input voltage CLK Rating Min (*B)Through mode H level VIH1 L level (*5) Output voltage (*4,6) (*5,7) Input current Input leakage current CLK Typ Max 4.5 8.0 mA 1.8 3.0 mA 0.7VDD V 0.3VDD VIL1 VINAC (*2,3,4) Unit AC coupling H level VIH2 L level VIL2 H level VIH3 L level VIL3 H level VOH1 IOH = - 0.5 mA L level VOL1 IOL = 0.5 mA H level VOH2 IOH = - 0.5 mA L level VOL2 IOL = 0.5 mA 1.0 V VP-P 0.7VDD V 0.3VDD 0.6VDD V V 0.2VDD VDD - 0.4 V V 0.4 VDD - 0.4 V V 0.4 V IIH1 VIN = VDD 5 15 115 µA IIL1 VIN = 0V 5 15 115 µA 1 2.5 (*3,4) IIL2 VIN = 0V 15 µA (*2,3,4,5) ILH VIN = VDD 1.0 µA (*2,5) ILL VIN = 0V 1.0 µA (*B) VDD1 = VDD2 = 3 V, CLK input frequency fXTI= 384fs = 16.9344 MHz, all outputs unloaded, SHPRF: Shock-proof, typical values are for VDD1 = VDD2 = 3 V. <Pin summary> (*1) Pin function Clock input pin (AC input) Pin name CLK (*2) Pin function Schmitt input pins Pin name YSRDATA, YLRCK, YSCK, YFLAG, YFCLK, NRESET, YBLKCK, YDMUTE, YMLD, YMDATA, YMCLK (*3) (*4) (*5) (*6) (*7) Pin function Schmitt input pin with pull-up Pin name NTEST Pin function I/O pins (Schmitt input with pull-up in input state) Pin name UC1, UC2, UC3, UC4, UC5 Pin function I/O pins (Schmitt input in input state) Pin name D0, D1, D2, D3 Pin function Outputs Pin name ZSCK, ZLRCK, ZSRDATA, ZSENSE Pin function Outputs Pin name NCAS, NWE, NRAS, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10 NIPPON PRECISION CIRCUITS-5 SM5903BF AC characteristics Standard voltage: VDD1 = VDD2 = 3.0 to 3.6 V, VSS = 0 V, Ta = -40 to 85 ˚C Low-voltage: VDD1 = VDD2 = 2.4 to 3.0 V, VSS = 0 V, Ta = -20 to 70 ˚C (*) Typical values are for fs = 44.1 kHz System clock (CLK pin) Parameter Symbol Condition Rating System clock Clock pulsewidth (HIGH level) Clock pulsewidth (LOW level) Clock pulse cycle tCWH tCWL tCY 384fs Unit Min Typ Max 26 29.5 125 ns 26 29.5 125 ns 58 59 250 ns System clock input CLK 0.5VDD t CWH t CWL t CY Serial input (YSRDATA, YLRCK, YSCK pins) Parameter Symbol YSCK pulsewidth (HIGH level) tBCWH tBCWL tBCY tDS tDH tBL tLB Rating Min YSCK pulsewidth (LOW level) YSCK pulse cycle YSRDATA setup time YSRDATA hold time Last YSCK rising edge to YLRCK edge YLRCK edge to first YSCK rising edge Typ Unit Max 75 ns 75 ns 150 ns 50 ns 50 ns 50 ns 50 ns 0 Condition 3fs Memory system ON YLRCK pulse frequency (MSON=H) See note below. fs fs Memory system OFF (MSON=L) Note. When the memory system is OFF (through mode), the input data rate is synchronized to the system clock input (384fs), so input data needs to be at 1/384 of this frequency. But, this IC can tolerate a certain amount of jitter. For details, refer to Through-mode operation. t BCWH t BCY t BCWL YSCK 0.5VDD t DS t DH YSRDATA 0.5VDD t BL YLRCK t LB 0.5VDD NIPPON PRECISION CIRCUITS-6 SM5903BF Microcontroller interface (YMCLK, YMDATA, YMLD, ZSENSE pins) Parameter Symbol Rating Min tMCWL tMCWH tMDS tMDH tMLWL tMLS tMLH tr tf tPZS YMCLK LOW-level pulsewidth YMCLK HIGH-level pulsewidth YMDATA setup time YMDATA hold time YMLD LOW-level pulsewidth YMLD setup time YMLD hold time Rise time Fall time ZSENSE output delay Unit Typ Max 30 + 2tCY ns 30 + 2tCY ns 30 + tCY ns 30 + tCY ns 30 + 2tCY ns 30 + tCY ns 30 + tCY ns 100 ns 100 ns 100 + 3tCY ns Note. tCY is the system clock cycle time (59ns typ). YMDATA 0.5VDD t MDS t MDH YMCLK 0.5VDD t MCWL t MCWH t MLS t MLH YMLD 0.5VDD t MLWL t PZS ZSENSE 0.5VDD tf YMCLK YMDATA YMLD tr 0.7 V DD 0.7 V DD 0.3 V DD 0.3 V DD 0.5VDD Reset input (NRESET pin) Parameter Symbol Rating Min First HIGH-level after supply voltage rising edge NRESET pulsewidth tHNRST tNRST 0 64 Typ Unit Max tCY (Note) tCY (Note) Note. tCY is the system clock (CLK) input (384fs) cycle time. tCY = 59 ns, tNRST (min) = 3.8 µs when fs = 44.1 kHz VDD1,VDD2 NRESET t HNRST t NRST NIPPON PRECISION CIRCUITS-7 SM5903BF Serial output (ZSRDATA, ZLRCK, ZSCK pins) Parameter Symbol Condition ZSCK pulsewidth tSCOW tSCOY tDHL tDLH 15 pF load Rating Min ZSCK pulse cycle ZSRDATA and ZLRCK output delay time Unit Typ Max 1/96fs 15 pF load 1/48fs 15 pF load 0 60 ns 15 pF load 0 60 ns ZSCK 0.5VDD t SCOW t SCOW t SCOY ZSRDATA ZLRCK 0.5VDD t DHL t DLH DRAM access timing (NRAS, NCAS, NCAS2, NWE, A0 to A10, D0 to D3) Parameter Symbol Condition NRAS pulsewidth tRASL tRASH tRCD tCASH tCASL tRADS tRADH tCADS tCADH tCWDS tCWDH tCRDS tCRDH tWEL tWCS 15 pF load Rating Min NRAS falling edge to NCAS falling edge NCAS pulsewidth NRAS Setup time falling edge to address Hold time NCAS Setup time falling edge to address Hold time NCAS Setup time falling edge to data write Hold time NCAS Input setup rising edge to data read Input hold NWE pulsewidth NWE falling edge to NCAS falling edge Refresh cycle 15 pF load tREF (RDEN=H) 3 2 5 15 pF load 3 15 pF load 1 15 pF load 1 15 pF load 1 15 pF load 5 15 pF load 3 15 pF load 3 40 ns 0 ns 15 pF load 6 15 pF load 3 tCY tCY 1.5 ms 6-bit compression 3.7 ms DRAM 5-bit compression 4.4 ms 4-bit compression 5.5 ms Non compression 3.0 ms 6-bit compression 7.3 ms DRAM 5-bit compression 8.8 ms × 1 or × 2 4-bit compression 10.9 ms Non compression 5.9 ms 6-bit compression 14.6 ms DRAM 5-bit compression 17.5 ms 21.8 ms ×1 Memory system ON Decode sequence operation tCY(note) tCY tCY tCY tCY tCY tCY tCY tCY tCY tCY Non compression 1M (fs = 44.1 kHz playback) Max 5 15 pF load 15 pF load Typ Unit 4M 16M ×1 4-bit compression Note. tCY is the system clock (CLK) input (384fs) cycle time. tCY = 59 ns when fs = 44.1 kHz NIPPON PRECISION CIRCUITS-8 SM5903BF DRAM access timing (with single DRAM) t RASL 5 tCY t RASH 3 tCY NRAS t RCD 2tCY t CASH 5tCY t CASL 3 tCY NCAS A0 to A10 ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, t RADS 1tCY t RADH 1tCY t CADS 1tCY t CADH 5tCY t CWDS 3tCY ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, t CWDH 3tCY ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, D0 to D3 (WRITE) t CRDS D0 to D3 (READ) t CRDH ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, t WCS 3tCY ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, t WEL 6tCY NWE (WRITE) The NWE terminal output is fixed HIGH during read timing. DRAM access timing (with 2 DRAMs) t RASL 5 tCY t RASH 3tCY NRAS NCAS (DRAM1 SELECT) NCAS2 (DRAM2 SELECT) A0 to A9 ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, t RADS 1tCY t CASL 3tCY t CASH 5tCY t RDC 2 tCY t CASL 3tCY t CASH 5tCY t CADS 1tCY t CWDS 3tCY D0 to D3 (WRITE) D0 to D3 (READ) t RADH 1tCY t RCD 2tCY t CADH 5tCY ,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,, ,,,,,,,,, t CWDH 3tCY ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, t t CRDS t CRDH WCS NWE (WRITE) 3 tCY t WCS ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,, t WEL 6 tCY The NWE terminal output is fixed HIGH during read timing. NCAS terminal output is fixed HIGH when selecting "DRAM2". NCAS2 terminal output is fixed HIGH when selecting "DRAM1". NIPPON PRECISION CIRCUITS-9 SM5903BF YSRDATA YSCK YLRCK ZSRDATA Output Interface YBLKCK YFCLK ZSCK SM5903 ZLRCK Block diagram Input Interface Control Input 1 YFLAG YMDATA YMCLK YMLD Input Buffer Microcontroller Interface ZSENSE Compression Mode UC1 to UC5 Through Mode General Port Decoder Encoder YDMUTE Control Input 2 D0 to D3 A0 to A10 NCAS NRAS CLK NWE DRAM Interface NTEST NCAS2 NRESET NIPPON PRECISION CIRCUITS-10 SM5903BF Functional description SM5903BF has two modes of operation; shockproof mode and through mode. The operating sequences are controlled using commands from a microcontroller. Microcontroller interface Command format Commands from the microcontroller are input using 3-wire serial interface inputs; data (YMDATA), bit clock (YMCLK) and load signal (YMLD). In the case of a read command from the microcontroller, bit serial data is output (ZSENSE) synchronized to the bit clock input (YMCLK). Write command format (Commands 80 to 85) DATA 8bit YMDATA D7 D6 D5 D4 D3 COMMAND 8bit D2 D1 D0 B7 B6 B5 B4 B3 B2 B1 B0 YMCLK YMLD Read command format (Commands 90, 91, 93) COMMAND 8bit YMDATA B7 B6 B5 B4 B3 B2 B1 B0 YMCLK YMLD STATUS 8bit ZSENSE S7 S6 S5 S4 S3 S2 S1 S0 Read command format (Command 92 (memory residual read)) COMMAND 8bit YMDATA B7 B6 B5 B4 B3 B2 B1 B0 YMCLK YMLD RESIDUAL DATA 16bit ZSENSE S7 S6 S1 S0 M1 M2 M7 M8 NIPPON PRECISION CIRCUITS-11 SM5903BF Command table Write command summary B3 B2 B1 B0 B7 B6 B5 B4 MS command 80 80hex = 1000 0000 Shock-proof memory system settings Bit Name Function D7 MSWREN Encode sequence start/stop H operation Reset level Start L D6 MSWACL Write address reset Reset L D5 MSRDEN Decode sequence start/stop Start L D4 MSRACL Read address reset Reset L D3 MSDCN2 MSDCN2=H, MSDCN1=H: 3-pair comparison start L MSDCN2=H, MSDCN1=L: 2-pair comparison start D2 MSDCN1 MSDCN2=L, MSDCN1=H: Direct-connect start L D1 WAQV Q data valid Valid L D0 MSON Memory system ON ON L MSDCN2=L, MSDCN1=L: Connect operation stop 81hex = 1000 0001 Extension I/O port input/output settings Bit B3 B2 B1 B0 B7 B6 B5 B4 Extension I/O settings 81 Name Function D4 UC5OE Extension I/O port UC5 input/output setting Output L D3 UC4OE Extension I/O port UC4 input/output setting Output L D2 UC3OE Extension I/O port UC3 input/output setting Output L D1 UC2OE Extension I/O port UC2 input/output setting Output L D0 UC1OE Extension I/O port UC1 input/output setting Output L H operation Reset level D7 D6 D5 B7 B6 B5 B4 Extension port HIGH/LOW output level A port setting is invalid if that port has already been defined as an input using the 81H command above. Bit B3 B2 B1 B0 Extension I/O output data settings 82 82hex = 1000 0010 Name Function D4 UC5WD Extension I/O port UC5 output data setting H output L D3 UC4WD Extension I/O port UC4 output data setting H output L D2 UC3WD Extension I/O port UC3 output data setting H output L D1 UC2WD Extension I/O port UC2 output data setting H output L D0 UC1WD Extension I/O port UC1 output data setting H output L H operation Reset level D7 D6 D5 NIPPON PRECISION CIRCUITS-12 SM5903BF B3 B2 B1 B0 B7 B6 B5 B4 MUTE, CMP12 settings 83 83hex = 1000 0011 Bit Name Function H operation Reset level MUTE Forced muting (changes instantaneously) Mute ON L CMP12 12-bit comparison connect/ 16-bit comparison connect 12-bit comparison L D7 D6 D5 D4 D3 D2 D1 D0 Refer to "Force mute", "12-bit comparison connection". B3 B2 B1 B0 B7 B6 B5 B4 Option settings 85 85hex = 1000 0101 Bit Name Function D7 RAMS1 DRAM type setting H operation Reset level L RAMS1=0 RAMS2=0 when 1MDRAM(256k × 4bit) × single RAMS1=1 RAMS2=0 when 4MDRAM(1M × 4bit) × single D6 RAMS2 RAMS1=0 RAMS2=1 when 4MDRAM(1M × 4bit) × double D5 YFLGS FLAG6 set conditions (reset using status read command 90H) L RAMS1=1 RAMS2=1 when 16MDRAM(4M × 4bit) × single L - When YFLGS=0, YFCKP=0, YFCLK input falling edge, YFLAG=L - When YFLGS=0, YFCKP=1, YFCLK input rising edge, YFLAG=L D4 YFCKP - When YFLGS=1, YFCKP=0, YFLAG=L L - When YFLGS=1, YFCKP=1, YFLAG=H D3 COMPFB Full-bit compression mode L D2 COMP6B 6-bit compression mode H D1 COMP5B 5-bit compression mode L D0 COMP4B 4-bit compression mode L When the number of compression bits is set incorrectly (2 or more bits in D0 to D3 are set to 1 or all bits are set to 0), 6-bit compression mode is selected. NIPPON PRECISION CIRCUITS-13 SM5903BF Read command summary B3 B2 B1 B0 B7 B6 B5 B4 Shock-proof memory status (1) 90 90hex = 1001 0000 Bit Name Function S7 FLAG6 Signal processor IC jitter margin exceeded HIGH-level state Exceeded S6 MSOVF Write overflow (Read once only when RA exceeds WA) DRAM overflow S5 BOVF Input buffer memory overflow Input buffer memory overflow because sampling rate of input data is too fast S4 S3 DCOMP Data compare-connect sequence operating S2 MSWIH Encode sequence stop due to internal factors Compare-connect sequence operating Encoding stopped S1 MSRIH Decode sequence stop due to internal factors Decoding stopped S0 Refer to "Status flag operation summary". B3 B2 B1 B0 B7 B6 B5 B4 Shock-proof memory status (2) 91 91hex = 1001 0001 Bit Name Function HIGH-level state S7 MSEMP Valid data empty state (Always HIGH when RA exceeds VWA) No valid data S6 OVFL Write overflow state (Always HIGH when WA exceeds RA) Memory full S5 ENCOD Encode sequence operating state Encoding S4 DECOD Decode sequence operating state Decoding S3 S2 S1 S0 Refer to "Status flag operation summary". NIPPON PRECISION CIRCUITS-14 SM5903BF B3 B2 B1 B0 B7 B6 B5 B4 Shock-proof memory valid data residual 92 92hex = 1001 0010 Bit Name Function S7 AM21 Valid data accumulated VWA-RA (MSB) 8M bits S6 AM20 4M bits S5 AM19 2M bits S4 AM18 1M bits S3 AM17 S2 AM16 512k bits 256k bits S1 AM15 S0 AM14 M1 AM13 128k bits 64k bits 32k bits M2 AM12 16k bits M3 AM11 8k bits M4 AM10 4k bits M5 AM09 2k bits M6 AM08 M7 AM07 M8 AM06 1k bits 512 bits 256 bits Note. The time conversion factor varies depending on the compression bit mode.(M = 1,048,576 K= 1,024) Residual time (sec) = Valid data residual (Mbits) × Time conversion value K where the Time conversion value K (sec/Mbit) ≈ 2.78(4 bits), 2.22 (5 bits), 1.85 (6 bits) and 0.74 (Full bits). Bit Name Function B3 B2 B1 B0 Input data entering (or output data from) an extension port terminal is echoed to the microcontroller. (That is, the input data entering an I/O port configured as an input port using the 81H command, OR the output data from a pin configured as an output port using the 82H command.) B7 B6 B5 B4 Extension I/O inputs 93 93hex = 1001 0011 HIGH-level state S7 S6 S5 S4 UC5RD S3 UC4RD S2 UC3RD S1 UC2RD S0 UC1RD NIPPON PRECISION CIRCUITS-15 SM5903BF Status flag operation summary Flag Read name method FLAG6 READ Meaning 90H bit 7 - Indicates to the CD signal processor DSP (used for error correction, de-interleaving) that a disturbance has exceeded the RAM jitter margin. Set - Set according to the YFLAG input and the operating state of YFCKP and YFLGS. FLAG6 set conditions When YFLGS=0, YFCKP=0, YFCLK input falling edge, YFLAG=L When YFLGS=0, YFCKP=1, YFCLK input rising edge, YFLAG=L When YFLGS=1, YFCKP=0, YFLAG=L When YFLGS=1, YFCKP=1, YFLAG=H Reset - By 90H status read - By 80H command when MSON=ON - After external reset MSOVF READ Meaning 90H bit 6 - Indicates once only that a write to external DRAM has caused an overflow. (When reset by the 90H status read command, this flag is reset even if the overflow condition continues.) Set Reset - When the write address (WA) exceeds the read address (RA) - By 90H status read - When a read address clear (MSRACL) or write address clear (MSWACL) command is issued - After external reset BOVF READ Meaning - Indicates input data rate was too fast causing buffer overflow and loss of data 90H Set - When inputs a data during a buffer memory overflow bit 5 Reset - By 90H status read - When a read address clear (MSRACL) or write address clear (MSWACL) command is issued - After external reset DCOMP READ Meaning - Indicates that a compare-connect sequence is operating 90H Set - When a (3-pair or 2-pair) compare-connect start command is received (MSDCN2=1) bit 3 - When a direct connect command is received (MSDCN2=0, MSDCN1=1) Reset - When a (3-pair or 2-pair) comparison detects conforming data - When the connect has been performed after receiving a direct connect command - When a compare-connect stop command (MSDCN2=0, MSDCN1=0) is received - When a MSWREN=1 command is received (However, if a compare-connect command is received at the same time, the compare-connect command has priority.) - After external reset MSWIH READ Meaning 90H bit 2 - Indicates that the encode sequence has stopped due to internal factors (not microcontroller commands) Set - When FLAG6 (above) is set - When BOVF (above) is set - When MSOVF (above) is set Reset - When conforming data is detected after receiving a compare-connect start command - When the connect has been performed after receiving a direct connect command - When a read address clear (MSRACL) or write address clear (MSWACL) command is received - After external reset MSRIH READ Meaning 90H bit 1 - Indicates that the decode sequence has stopped due to internal factors (not microcontroller commands) Set - When the valid data residual becomes 0 Reset - By 90H status read - When a read address clear (MSRACL) or write address clear (MSWACL) command is issued - After external reset NIPPON PRECISION CIRCUITS-16 SM5903BF Flag Read name method MSEMP READ Meaning - Indicates that the valid data residual has become 0 91H Set - When the VWA (final valid data's next address) bit 7 = RA (address from which the next read would take place) Reset OVFL - Whenever the above does not apply READ Meaning - Indicates a write to external DRAM overflow state 91H Set - When the write address (WA) exceeds the read address (RA). bit 6 (Note: This flag is not set when WA=RA through an address initialize or reset operation.) Reset - When the read address (RA) is advanced by the decode sequence - When a read address clear (MSRACL) or write address clear (MSWACL) command is issued - After external reset ENCOD READ Meaning - Indicates that the encode sequence (input data entry, encoding, DRAM write) is operating 91H Set - By the 80H command when MSWREN=1 bit 5 - When conforming data is detected during compare-connect operation - When the connect has been performed after receiving a direct connect command Reset - When the FLAG6 flag=1 (above) - When the OVFL flag=1 (above) - By the 80H command when MSWREN=0 - By the 80H command when MSDCN1=1 or MSDCN2=1 (compare-connect start command) - By the 80H command when MSON=0 - After external reset Note. Reset conditions have priority over set conditions. For example, if the 80H command has MSWREN=1 and MSDCN1=1, the ENCOD flag is reset and compare-connect operation starts. DECOD READ Meaning 91H bit 4 - Indicates that the decode sequence (read from DRAM, decoding, attenuation, data output) is operating Set - By a new 80H command when MSRDEN=1 and the MSEMP flag=0 (above) Reset - Whenever the above does not apply NIPPON PRECISION CIRCUITS-17 SM5903BF Write command supplementary information 80H (MS command) - MSWREN When 1: Encode sequence starts Invalid when MSON is not 1 within the same 80H command Invalid when FLAG6=1 Invalid when OVFL=1 Invalid when a compare-connect start command (MSDCN2=1 or MSDCN1=1) occurs simultaneously Direct connect if a compare-connect sequence is already operating When 0: Encode sequence stops - MSWACL When 1: Initializes the write address (WA) When 0: No operation - MSRDEN When 1: Decode sequence starts Does not perform decode sequence if MSON=1.If there is no valid data, decode sequence temporarily stops. But, because the MSRDEN flag setting is maintained as is, the sequence automatically re-starts when valid data appears. When 0: Decode sequence stops -MSRACL When 1: Initializes the read address (RA) When 0: No operation - MSDCN2, MSDCN1 When 1 and 1: 3-pair compare-connect sequence starts When 1 and 0: 2-pair compare-connect sequence starts When 0 and 1: Direct connect sequence starts When 0 and 0: Compare-connect sequence stops. No operation if a compare-connect sequence is not operating. - WAQV When 1: The immediately preceding YBLKCK falling-edge timing WA (write address) becomes the VWA (valid write address). When 0: No operation - MSON When 1: Memory system turns ON and shockproof operation starts When 0: Memory system turns OFF and throughmode playback starts. (In this mode, the attenuator is still active.) 81H (Extension I/O port settings) 82H (Extension I/O port output data settings) NIPPON PRECISION CIRCUITS-18 SM5903BF 83H ( MUTE, 12-bit comparison connection settings) - MUTE (forced muting) When 1: Outputs are instantaneously muted to 0.(note 1) Same effect as taking the YDMUTE pin HIGH. When 0: No muting(note 1) (note1) Effective at the start left-channel output data. - MUTE, YDMUTE relationship When all mute inputs are 0, mute is released. - CMP12 (12-bit comparison connection) When 1: Performs comparison connection using only the most significant 12 bits of input data. When 0: Performs comparison connection using all 16 bits of input data. 85H (option settings) - RAMS1, RAMS2 When 0 and 0 : 1M DRAMs (256k×4 bits)×single When 1 and 0 : 4M DRAMs (1M×4 bits)×single - COMPFB, COMP6B, COMP5B, COMP4B When 0, 0, 0 and 1: Selects 4-bit compression mode When 0 and 1 : 4M DRAMs (1M×4 bits)×double When 0, 0, 1 and 0: Selects 5-bit compression mode When 1 and 1 : 16M DRAMs (4M×4 bits)×single - YFLGS, YFCKP When 1, 0, 0 and 0: Selects full-bit compression mode When 0 and 0: Sets FLAG6 on the falling edge of YFCLK when YFLAG=0 When 0 and 1: Sets FLAG6 on the rising edge of YFCLK when YFLAG=0 In all other cases: Selects 6-bit compression mode Changing mode without initializing during operation is possible. When 1 and 0: Sets FLAG6 when YFLAG=0 When 1 and 1: Sets FLAG6 when YFLAG=1 NIPPON PRECISION CIRCUITS-19 SM5903BF Shock-proof operation overview Shock-proof mode is the mode that realizes shockproof operation using external DRAM. Shock-proof mode is invoked by setting MSON=H in microcon- troller command 80H. This mode comprises the following 3 sequences. - Encode sequence 1. Input data from a signal processor IC is stored in internal buffers. 2. Encoder starts after a fixed number of data have been received. 3. The encoder, after the most suitable predicting filter type and quantization steps have been determined, performs ADPCM encoding and then writes to external DRAM. - Decode sequence 1. Reads compressed data stored in external buffer RAM at rate fs. 2. Decoder starts, using the predicting filter type and quantization levels used when encoded. 3. Outputs the result. - Compare-connect sequence 1. Encoding immediately stops when either external buffer RAM overflows or when a CD read error occurs due to shock vibrations. 2. Then, using microcontroller command 80H, the compare-connect start command is executed and compare-connect sequence starts. 3. Compares data re-read from the CD with the processed final valid data stored in RAM (confirms its correctness). 4. As soon as the comparison detects conforming data, compare-connect sequence stops and encode sequence re-starts, connecting the data directly behind previous valid data. NIPPON PRECISION CIRCUITS-20 SM5903BF RAM addresses The SM5903BF uses either 1 or 2 external 1M or 4M DRAMs as external buffers. Three kinds of addresses are used for external RAM control. WA (write address) RA (read address) VWA (valid write address) Among these, VWA is the write address for conforming data whose validity has been confirmed. Determination of the correctness of data read from the CD is delayed relative to the encode write processing, so VWA is always delayed relative to WA. Connect data work area RA WA VWA Valid data area The region available for valid data is the area between VWA-RA. - Connect data work area This is an area of memory reserved for connect data. This area is 2k bits if using 1M DRAMs, 4k bits if using 4M DRAMs, or 8k bits if using 16M DRAMs. Fig 1. RAM addresses VWA (valid write address) The VWA is determined according to the YBLKCK pin and WAQV command. Refer to the timing chart below. 1.YBLKCK is a 75 Hz clock(HIGH for 136 µs) when used for normal read mode and it is a 150 Hz clock when used for double-speed read mode, synchronized to the CD format block end timing. When this clock goes LOW, WA which is the write address of internal encode sequence, is stored (see note 2). 2.The microcontroller checks the subcode and, if confirmed to be correct, generates a WAQV command (80H). 3.When the WAQV command is received, the previously latched WA is stored as the VWA. (note 2) Actually, there is a small time difference, or gap, between the input data and YBLKCK. This gap serves to preserves the preceding WA to protect against incorrect operation. 13.3ms VWA latch set YBLKCK WAQV set Microcontroller data set Refer to Microcontroller interface VWA VWA(x) VWA(x + 1) Values shown are for rate fs. The values are 1/2 those shown at rate 2fs. Fig 2. YBLKCK and VWA relationship NIPPON PRECISION CIRCUITS-21 SM5903BF YFLAG, YFCLK, FLAG6 Correct data demodulation becomes impossible for the CD signal processor IC when a disturbance exceeding the RAM jitter margin occurs. The YFLAG signal input pin is used to indicate when such a condition has occurred. The YFCLK is a 7.35 kHz clock synchronized to the CD format frame 1. The IC checks the YFLAG input and stops the encode sequence when such a disturbance has occurred, and then makes FLAG6 active. The YFLAG check method used changes depending on the YFLGS flag and YFCKP flag (85H command). See table1. If YFLAGS is set to 1, then YFCLK should be tied either High or Low. 85H command 1 YFLGS YFCKP FLAG6 set conditions FLAG6 reset conditions 0 0 When YFLAG=LOW on YFCLK input falling edge - By status read (90H command) 1 When YFLAG=LOW on YFCLK input rising edge - When MSON=LOW 2 3 4 1 0 When YFLAG=LOW 1 When YFLAG=HIGH YFCLK be tied either High or Low - After system reset Table 1. YFLAG signal check method NIPPON PRECISION CIRCUITS-22 SM5903BF Compare-connect sequence The SM5903BF supports three kinds of connect modes; 3-pair compare-connect, 2-pair compareconnect and direct connect. Note that the SM5903BF can also operate in 12-bit comparison connect mode using only the most significant 12 bits of data for connection operation. In 3-pair compare-connect mode, the final 6 valid data (3 pairs of left- and right-channel data input before encode processing) and the most recently input data are compared until three continuous data pairs all conform. At this point, the encode sequence is re-started and data is written to VWA. In 2-pair compare-connect mode, comparison occurs just as for 3-pair comparison except that only 2 pairs from the three compared need to conform with the valid data. At this point, the encode sequence is re-started and data is written to VWA. In direct-connect mode, comparison is not performed at all, and encode sequence starts and data is written to the VWA. This mode is for systems that cannot perform compare-connect operation. - Compare-connect preparation time 1. Comparison data preparation time Internally, when the compare-connect start command is issued, a sequence starts to restore the data for comparison. The time required for this preparation after receiving the command is approximately 2.5 × (1/fs). (approximately 60 µs when fs = 44.1 kHz) 2. After the above preparation is finished, data is input beginning from the left-channel data and comparison starts. 3. If the compare-connect command is issued again, the preparation time above is not necessary and operation starts from step 2. 4. The same sequence takes place in direct-connect mode also. However, at the point when 3 words have been input, all data is directly connected as if comparison and conformance had taken place. - Compare-connect sequence stop If a compare-connect stop command (80H with MSDCN1= 1, MSDCN2= 0) is input from the microcontroller, compare-connect sequence stops. If compare-connect sequence was not operating, the compare-connect stop command performs no operation. However, make sure that the other bit settings within the same 80H command are valid. NIPPON PRECISION CIRCUITS-23 SM5903BF Encode sequence temporary stop - When RAM becomes full, MSWREN is set LOW using the 80H command and encode sequence stops. (For details of the stop conditions, refer to the description of the ENCOD flag.) - Then, if MSWREN is set HIGH without issuing a compare-connect start command, the encode sequence re-starts. At this time, new input data is written not to VWA, but to WA. In this way, the data already written to the region between VWA and WA is not lost. - But if the MSWREN is set HIGH (80H command) after using the compare-connect start command even only once, data is written to VWA. If data is input before comparison and conformance is detected, the same operation as direct-connect mode takes place when the command is issued. After comparison and conformance are detected, no operation is performed because the encode sequence has already been started. However, make sure that the other bit settings within the same 80H command are valid. DRAM refresh - DRAM initialization refresh A 15-cycle RAS-only refresh is carried out for DRAM initialization under the following conditions. When MSON changes from 0 to 1 using command 80H. When from MSON=1, MSRDEN=0 and MSWREN=0 states only MSWREN changes to 1. In this case, encode sequence immediately starts and initial data is written (at 2fs rate input) after a delay of 0.7ms. - Refresh during Shock-proof mode operation In this IC, a data access operation to any address also serves as a data refresh. Accordingly, there are no specific refresh cycles other than the initialization refresh cycle (described above). This has the resulting effect of saving on DRAM power dissipation. A data access to DRAM can occur in an encode sequence write operation or in a decode sequence read operation. Write sequence write operation stops during a connect operation whereas a read sequence read operation always continues while data is output to the D/A. The refresh rate for each DRAM during decode sequence is shown in the table below. The decode sequence, set by MSON=1 and MSRDEN=1, operates when valid data is in DRAM (when MSEMP=0). - When MSON=0, DRAM is not refreshed because no data is being accessed. Although MSON=1, DRAM is not refreshed if ENCOD=0 and DECOD=0 (both encode and decode sequence are stopped). DRAMs used (same for 1 or 2 DRAMs) Data compression mode 1M (256K×4 bits) 4M (1M×4 bits) 16M(4M×4 bits) 4 bit 5.44 ms 10.88 ms 21.77ms 5 bit 4.35 ms 8.71 ms 17.42ms 6 bit 3.63 ms 7.26 ms 14.52ms Full bit 1.36 ms 2.72 ms 5.81ms Table 2. Decode sequence refresh rate NIPPON PRECISION CIRCUITS-24 SM5903BF Through-mode operation If MSON is set LOW (80H command), an operating mode that does not perform shock-proof functions becomes active. In this case, input data is passed as-is (except Force mute operation) to the output. External DRAM is not accessed. - In this case, input data needs to be at a rate fs and the input word clock must be synchronized to the CLK input (384fs). However, short-range jitter can be tolerated (jitter-free system). - Jitter-free system timing starts from the first YLRCK rising edge after either (A) a reset (NRESET= 0) release by taking the reset input from LOW to HIGH or (B) by taking MSON from HIGH to LOW. Accordingly, to provide for the largest possible jitter margin, it is necessary that the YLRCK clock be at rate fs by the time jitter-free timing starts. The jitter margin is 0.2/ fs (80 clock cycles). This jitter margin is the allowable difference between the system clock (CLK) divided by 384 (fs rate clock) and the YLRCK input clock. If the timing difference exceeds the jitter margin, irregular operation like data being output twice or, conversely, incomplete data output may occur. In the worst case, a click noise may also be generated. When switching from shock-proof mode to through mode, an output noise may be generated, and it is therefore recommended to use the YDMUTE setting to mute ZSRDATA until just before data output. Force mute Serial output data is muted by setting the YDMUTE pin input HIGH or by setting the MUTE flag to 1. Mute starts and finishes on the leading left-channel bit. When MSON is HIGH and valid data is empty (MSEMP=H), the output is automatically forced into the mute state. 12-bit comparison connection When the CMP12 flag is set to 1, the least significant 4 bits of the 16-bit comparison connection input data are discarded and comparison connection is performed using the remaining 12 bits. Note that if the CMP12 flag is set to 1 during a comparison connection operation, only the most significant 12 bits are used for comparison connection from that point on. NIPPON PRECISION CIRCUITS-25 SM5903BF Timing charts Input timing (YSCK, YSRDATA, YLRCK) 16 16 L ch R ch YSCK LSB MSB LSB MSB LSB YSRDATA YLRCK 1/(3fs ) Output timing (ZSCK, ZSRDATA, ZLRCK) 1 9 24 33 48 ZSCK L ch LSB MSB LSB MSB LSB ZSRDATA R ch ZLRCK 1/fs NIPPON PRECISION CIRCUITS-26 SM5903BF DRAM write timing (NRAS, NCAS, NCAS2, NWE, A0 to A10, D0 to D3) Write timing (with single DRAM) t RASL t RASH NRAS t CASH t CASL t RDC NCAS t RADS A0 to A10 ,,,,,,,, ,,,,,,,, ,,,,,,,, ,,,,,,,, t CADS t RADH t CADH t CWDS ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, t CWDH ,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,, D0 to D3 (WRITE) t WEL NWE Write timing (with 2 DRAMs) t RASL t RASH NRAS t RDC t CASL t CASH t RDC t CASL t CASH NCAS1 (DRAM1 SELECT) NCAS2 (DRAM2 SELECT) t RADS A0 to A9 ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, t RADH t CADS t CADH t CWDS t CWDH D0 to D3 (WRITE) t WEL ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, ,,,,,,,,,,,,,, NWE NIPPON PRECISION CIRCUITS-27 SM5903BF DRAM read timing (NRAS, NCAS, NCAS2, NWE, A0 to A10, D0 to D3) Read timing (with single DRAM) t RASL t RASH NRAS t RCD t CASL t CASH NCAS ,,,,,,, ,,,,,,, A0 to A10 ,,,,,,, ,,,,,,, ,,,,,,, t RADS t RADH t CADS t CADH ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, D0 to D3 ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, (READ) ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, t CRDS ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, ,,,,,,,,,,,, ,,,,,,,,, t CRDH ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, t OEL NWE Read timing (with 2 DRAMs) t RASL t RASH NRAS t RCD t CASL t CASH t RCD t CASL t CASH NCAS1 (DRAM1 SELECT) NCAS2 (DRAM2 SELECT) A0 to A9 D0 to D3 (READ) ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, ,,,,,,, t RADS t RADH t CADS ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, t CADH t CRDS t CRDH ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,, ,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,, NWE NIPPON PRECISION CIRCUITS-28 SM5903BF Connection example SM5903 Microcontroller YMDATA YMCLK YMLD ZSENSE UC1 to UC5 DRAM 1 DSP Matsushita MN662740 YBLKCK YFCLK YFLAG NRAS NWE A0 to A10 D0 to D3 NCAS YSCK YLRCK YSRDATA RAS WE A0 to A10 D0 to D3 CAS OE DRAM 2 NRAS RAS NWE WE A0 to A9 A0 to A9 D0 to D3 D0 to D3 CAS OE NCAS2 D/A converter ZSCK ZLRCK ZSRDATA CLK NRESET YDMUTE SM5903 Microcontroller YMDATA YMCLK YMLD ZSENSE UC1 to UC5 DRAM 1 SCOR XROF DSP SONY CXD2517 YSCK YLRCK YSRDATA YBLKCK YFLAG YFCLK NRAS NWE A0 to A10 D0 to D3 NCAS RAS WE A0 to A10 D0 to D3 CAS OE DRAM 2 NRAS NWE A0 to A9 D0 to D3 RAS WE A0 to A9 D0 to D3 CAS OE NCAS2 ZSCK ZLRCK D A ZSRDATA CLK NRESET YDMUTE note1 - When 2 DRAMs are used, the DRAM OE pins should be tied LOW. - When single DRAM is used, the DRAM OE pin should be tied LOW or controlled by the SM5903BF NOE signal. note 2 When CXD 2517 (Sony) is used Set 85H of microcontroller command (option setting) as setting YFLAG take in; D5: YFLAGS= 1 D4: YFCKP= 0 NIPPON PRECISION CIRCUITS-29 SM5903BF Device comparison with SM5902AF Pin differences Pin No. SM5902AF SM5903BF 7 pin DIT (N.C) VDD pins SMl5902AF has a built-in level shifter to use 5V DARM during IC operation with 3V, therefore, it has 2 electrical power terminals. VDD 1 is an electrical power terminal used for internal ICs and VDD 2 is an electrical power terminal used for external DRAM interface. Regarding SM5903BF, VDD can’t be set to other voltage due to the different processing. Therefore, make sure to set VDD 1 and VDD 2 to the same voltage. Deleted functions from SM5902AF 1) DIT function 2) Digital attenuator function 3) Soft mute function 4) Noise shaper function during compress encoding 5) Compression mode switching function during shock proof operation Microcontroller interface extensions Microcomputer commands listed below are deleted from SM5902AF. Obsolete commands Command Bit 83H 84H Name Function D4 NS Noise shaper ON/OFF switch D5 SOFT Soft muting ON/OFF switch D7 ATT Attenuator ON/OFF switch D0 to D7 K0 to K7 Attenuation level settings 86H D4 to D7 Digital audio interface settings 87H D0 to D11 Subcode Q data settings 91H S3 QRDY Q data write buffer status Compression mode switching Compression mode switching using 85 H command of SM5903BF can’t be changed during shockproof operation. In order to switch compression mode, it is necessary to change it to “through-mode” first and change the compression mode setting, then again set shock- proof mode ( Detailed switching procedure is available ). Attentions About SM5903BF, Soft mute function and Attenuation function are deleted. In order not to cause audio output noise, it is necessary to activate Soft mute after DA converter. NIPPON PRECISION CIRCUITS-30 SM5903BF NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. NIPPON PRECISION CIRCUITS INC. 4-3, FUKUZUMI 2 CHOME, KOTO-KU TOKYO,135-8430, JAPAN Telephon: +81-3-3642-6661 Facsimile: +81-3-3642-6698 NC9819AE 1999.8 NIPPON PRECISION CIRCUITS-31