Hitachi HDR081, Service Manual, Page: 7 / 45

SERVICE MANUAL
The STi5100 has a local memory interface (LMI) and a flash and peripheral interface (FMI). The
STi5100's local memory interface is used for all data requirements in unified memory applications,
including graphics, video and audio buffers. It provides 16-bit wide DDR SDRAM support only at up to
166 MHz. The FMI provides support for 16-bit wide peripherals, flash and synchronous flash.
Local memory interface (LMI)
The LMI is a 16-bit wide DDR SDRAM interface with a peak bandwidth of 664 Mbyte/s (166
MHz). It supports one bank of 128-Mbit, 256-Mbit, or 512-Mbit DDR SDRAM. The LMI provides a fully
cacheable address space for data and instructions, with data cacheability controlled in 512 Kbyte blocks
for up to 8 Mbytes.
Flash and peripheral memory interface (FMI)
The FMI provides a glueless interface to SRAM, flash, SFlash and peripherals, in up to four
configurable banks over a 16-bit wide interface. Bus cycle strobe timings can be programmed from 0 to 15
phases for slower peripherals. The FMI output drive of the STi5100/STi5101 is programmable on a bus-
by-bus basis. Support is provided for connection to an ATAPI HDD.
4.2 Transport stream processing
The STi5100 supports dual independent transport stream inputs using an SRAM-based packet
merger and a single programmable transport interface (PTI). The merger buffers a packet pair per channel.
The incoming transport packets are tagged with a source ID and a time stamp.
Programmable transport interface (PTI)
The PTI performs transport-stream descrambling, demultiplexing and data filtering. PESdata is
transferred by DMA to audio and video decoders using circular buffers. Section data is transferred by
DMA to separate buffers for further processing by the CPU.
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DIRECTV and DVB transport streams can be handled by the PTI with data rates up to 138 Mbit/s.
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The PTI performs PID filtering to select audio, video and data packets to be processed. 96 PID
slots can be supported by the PTI.
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The PTI can descramble streams using the following ciphers:
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DES-ECB,
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DES-CBC including DVS-042 and cipher text stealing termination block handling,
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DVB-CSA,
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NDS specific streams can also be supported for integrated ICAM functionality.
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The PTI has a section filter core that filters DVB and DIRECTV standard sections. Four filtering
modes are available:
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wide match mode: 48x 16-byte filters,
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long match mode: 96x 8-byte filters,
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positive/negative mode: 48x 8-byte filters with positive/negative filtering at the bit level.
Matching sections are transferred to memory buffers for processing by software.
When the PTI is required to output a transport stream, it can output the entire transport stream or selected
packets filtered by PID. A latency counter is provided to ensure packet timing is preserved. Packet
substitution can also be performed.
4.3 Audio subsystem
The audio subsystem supports multichannel audio decoding and mixing with internal PCM files.
Decoding of MPEG-1 layers I, II, MP3 and Dolby Digital stereo are supported.Decoded multichannel
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