Setting a segment at specific address

Hello

I am trying to define a segment of 259 bytes at a specific address in my XRAM. I am using assembly and I am doing the following:

PROG    SEGMENT CODE
STACK   SEGMENT IDATA
DOWNLOAD_BUFFER SEGMENT XDATA

        RSEG    DOWNLOAD_BUFFER
        DS      259
        XSEG    AT 0100h

        RSEG  STACK
        DS    10H  ; 16 Bytes Stack

        CSEG  AT   0
        USING   0  ; Register-Bank 0
; Execution starts at address 0 on power-up.
        JMP   START

        RSEG  PROG
; first set Stack Pointer
START:
        CLR             P2.5
        CLR             P2.6
        ;Config I2C
        ;Set I2C interface
        CLR             SPE
        MOV             I2CADD, #44h
        MOV             I2CCON, #80hinterrupt.
        MOV             DPCON, #04h
        MOV             CFG841, #01h
        CALL    INIT_RAM
?ProcessI2C:
        CALL    GET_NEW_I2C_DATA
        JMP             ?ProcessI2C

The segment "DOWNLAOD BUFFER" is properly created and the length of it 259 bytes like I want to. However, I cannot set it at address 100h like I'd like to.

When I look at the map file, I see the following:

            TYPE    BASE      LENGTH    RELOCATION   SEGMENT NAME
            -----------------------------------------------------

            * * * * * * *   D A T A   M E M O R Y   * * * * * * *
            REG     0000H     0008H     ABSOLUTE     "REG BANK 0"
            IDATA   0008H     0010H     UNIT         STACK

            * * * * * * *  X D A T A   M E M O R Y  * * * * * * *
            XDATA   0000H     0103H     UNIT         DOWNLOAD_BUFFER

            * * * * * * *   C O D E   M E M O R Y   * * * * * * *
            CODE    0000H     0003H     ABSOLUTE
            CODE    0003H     0135H     UNIT         PROG



SYMBOL TABLE OF MODULE:  I2C Slave Polling ASM only (MAIN)

  VALUE           TYPE          NAME
  ----------------------------------

  -------         MODULE        MAIN
  C:0003H         SEGMENT       PROG
  I:0008H         SEGMENT       STACK
  X:0000H         SEGMENT       DOWNLOAD_BUFFER

DOWNLOAD_BUFFER is set at address 0000h and not at 100h like I would expect it. Why? Could someone tell me what I am doing wrong or what I should do?

Thanks a lot
Laurent