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1. IntroductionThis application note highlights the differences between the DS21354 / DS21554 and the DS2154. The DS21354 / DS21554 is a superset of the DS2154 maintaining a consistent pin out and register set. All of the original features of the DS2154 have been retained and software created for the DS2154 is transferable to the DS21354 / DS21554 with minimal effort. The DS21354 and DS21554 are functionally equivalent with the only difference being the required supply voltage — the DS21354 operates at 3.3V and the DS21554 operates at 5V.
2. Additional Functionality New Features Data Sheet Section HDLC controller 15 JTAG 17 8 Mbps interleaved PCM bus operation 18 3.3V operation with 5V tolerant I / O (for DS21354) 17
3. Changes in Register DefinitionsWhen implementing the new features of the DS21354 / DS21554, a priority was placed on preserving the DS2154's register map to facilitate code migration from existing DS2154 designs. This section highlights register additions and differences found in the DS21354 / DS21554.
3.1 New Feature Register UsageHighlights new registers related to new features. Each item can be found in the data sheet under the listed sections.
3.1.1 Common Control Register Register Address Description CCR6 1Dh Common Control Register 6
3.2 HDLC Controller (section 15) Register Address Description HCR B0h HDLC Control Register HSR B1h HDLC Status Register HIMR B2h HDLC Interrupt Mask Register RHIR B3h Receive HDLC Information Register RHFR B4h Receive HDLC FIFO Register THIR B6h Transmit HDLC Information Register THFR B7h Transmit HDLC FIFO Register RDC1 B8h Receive HDLC DS0 Control Register 1 RDC2 B9h Receive HDLC DS0 Control Register 2 TDC1 BAh Transmit HDLC DS0 Control Register 1 TDC2 BBh Transmit HDLC DS0 Control Register 2
3.1.2 Interleaved PCM Bus Operation (section 18) Register Address Description IBO B5h Interleave Bus Operation
3.2 Bit Assignment Changes within Existing RegistersHighlights bit locations in the DS21354 / DS21554 which have changed from the DS2154. Register Bit # DS2154 Symbol DS2154 Description DS21354 / DS21554 Symbol DS21354 / DS21554 Description CCR3 4 N / A Not assigned ESR Elastic Store Reset CCR5 6 N / A Not assigned RESALGN Receive Elastic Store Align CCR5 5 N / A Not assigned TESALGN Transmit Elastic Store Align
4. Changes in Device Pin Out 4.1 Package typesThe DS2154 and DS21354 / DS21554 are both offered in a 100 pin 14 x 14 x 1.4 mm LQFP. Values ​​listed are for body dimensions. 4.2 Device Pin Differences 4.2.1 JTAG Pins Pin # DS21354 / DS21554 DS2154 Description 2 JTMS NC IEEE 1149.1 Test Mode Select 4 JTCLK NC IEEE 1149.1 Test Clock Signal 5 JTRST NC IEEE 1149.1 Test Reset 7 JTDI NC IEEE 1149.1 Test Data Input 10 JTDO NC IEEE 1149.1 Test Data Output
4.2.2 Interleaved PCM Bus Pins Pin # DS21354 / DS21554 DS2154 Description 36 CI NC Carry In 54 CO NC Carry Out
4.2.3 Framer Mode Select Pin Pin # DS21354 / DS21554 DS2154 Description 76 FMS NC Framer Mode Select 
DS21354 / DS21554 and DS2154 single-chip transceiver-D
Abstract: This applicaTIon note provides a list of the differences between Dallas Semiconductor / Maxim CommunicaTIons Products DS21354 / DS21554 and DS2154 single chip transceivers (SCTs). The addiTIonal features contained in the DS21354 / DS21554 are highlighted along with the addiTIonal registers required for support of the new features, HDLC controller, interleaved bus operation (IBO), and JTAG.