Samsung OfficeServ 12 Service Manual

Also see for OfficeServ 12: General description

© SAMSUNG Electronics Co., Ltd. 11• PBRESET: Push button Reset(Tact Switch: Attached on base board)Yields same result as Power On Reset.• HRESET: Hard Reset by BDM(Background Debugger Mode)Watch Dog Reset also yields same result as HRESET.• PORESET: Power Monitor ResetUsed as internal reset signal of CPLD and Power On Reset(_PORESET) Pin of MPC855T.• SRESET: Soft Reset by JTAG BDM• WDRESET: Requests CPU for H/W reset if a programmable trigger signal is notgenerated within a certain time(1.6 sec), which is recognized as a system error.WDRESET can either be disabled/enabled by external resistance, or an NMI InterruptRequest can be sent.4.2.2.4 MemoryThe OfficeServ 12 system contains memories such as SRAM, SDRAM, NAND flashmemory, and boot ROM.SRAMThis SRAM(Static Random Access Memory) working memory must be backed up bybattery. Characteristics of SRAM are as follows:• Device: SAMSUNG, K6F8016U6A-EF70• Memory Capacity: 1 MByte(512 K x 16) x 2• Quantity: 2• Power: 3.3 V• Bus Bandwidth: 16 bits(Interfaces with CPU through 32-bit bus)• Retention Voltage: Min 1.5 V• SRAM is used for DB data storage.• SRAM has a 32-bit bus, and supports 8/16/32 bit access upon S/W request.• A common address/data bus is shared with the CPU.• SRAM uses Internal Wait for Wait Control.SDRAMThis SDRAM(Synchronous Dynamic Random Access Memory) working memory is usedfor storage, operation, and data memory of programs. Characteristics of SDRAM are asfollows:• Device: SAMSUNG, K4S281632C-TL1L 128M(2 M x 16 x 4 bit) or SAMSUNG,K4S561632 256M(4 M x 16 x 4 bit)• Memory Capacity: 16 MByte x 2, or 32 MByte x 2• Quantity: 2• Power: 3.3 V